Version: 263.0.1

commit d4f265c314
Author: PJB3005 <pieterjan.briers+git@gmail.com>
Date:   Sun Sep 14 14:32:44 2025 +0200

    Fix incorrect path combine in DirLoader and WritableDirProvider

    This (and the other couple past commits) reported by Elelzedel.

commit 7654d38612
Author: PJB3005 <pieterjan.briers+git@gmail.com>
Date:   Sat Sep 13 22:50:51 2025 +0200

    Move CEF cache out of data directory

    Don't want content messing with this...

commit cdcc255123
Author: PJB3005 <pieterjan.briers+git@gmail.com>
Date:   Sat Sep 13 19:11:16 2025 +0200

    Make Robust.Client.WebView.Cef.Program internal.

commit 2f56a6a110
Author: PJB3005 <pieterjan.briers+git@gmail.com>
Date:   Sat Sep 13 19:10:46 2025 +0200

    Update SpaceWizards.NFluidSynth to 0.2.2

commit 16fc48cef2
Author: PJB3005 <pieterjan.briers+git@gmail.com>
Date:   Sat Sep 13 19:09:43 2025 +0200

    Hide IWritableDirProvider.RootDir on client

    This shouldn't be exposed.

(cherry picked from commit 2f07159336bc640e41fbbccfdec4133a68c13bdb)
(cherry picked from commit d6c3212c74373ed2420cc4be2cf10fcd899c2106)
(cherry picked from commit bfa70d7e2ca6758901b680547fcfa9b24e0610b7)
(cherry picked from commit 06e52f5d58efc1491915822c2650f922673c82c6)

Directory.Packages.props

@@ -57,7 +57,7 @@
     <PackageVersion Include="SharpZstd.Interop" Version="1.5.2-beta2" />
     <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.7" />
     <PackageVersion Include="SpaceWizards.HttpListener" Version="0.1.1" />
-    <PackageVersion Include="SpaceWizards.NFluidsynth" Version="0.1.1" />
+    <PackageVersion Include="SpaceWizards.NFluidsynth" Version="0.2.2" />
     <PackageVersion Include="SpaceWizards.SharpFont" Version="1.0.2" />
     <PackageVersion Include="SpaceWizards.Sodium" Version="0.2.1" />
     <PackageVersion Include="TerraFX.Interop.Windows" Version="10.0.26100.1" />

MSBuild/Robust.Engine.Version.props

@@ -1,4 +1,4 @@
 <Project>
 
-    <!-- This file automatically reset by Tools/version.py -->
+    <!-- This file automatically reset by Tools/version.py -->
 

RELEASE-NOTES.md

@@ -54,6 +54,149 @@ END TEMPLATE-->
 *None yet*
 
 
+## 263.0.1
+
+
+## 263.0.0
+
+### Breaking changes
+
+* Fully removed some non-`Entity<T>` container methods.
+
+### New features
+
+* `IMidiRenderer.LoadSoundfont` has been split into `LoadSoundfontResource` and `LoadSoundfontUser`, the original now being deprecated.
+* Client command execution now properly catches errors instead of letting them bubble up through the input stack.
+* Added `CompletionHelper.PrototypeIdsLimited` API to allow commands to autocomplete entity prototype IDs.
+* Added `spawn:in` Toolshed command.
+* Added `MapLoaderSystem.TryLoadGeneric` overload to load from a `Stream`.
+* Added `OutputPanel.GetMessage()` and `OutputPanel.SetMessage()` to allow replacing individual messages.
+
+### Bugfixes
+
+* Fixed debug asserts when using MIDI on Windows.
+* Fixed an error getting logged on startup on macOS related to window icons.
+* `CC-BY-NC-ND-4.0` is now a valid license for the RGA validator.
+* Fixed `TabContainer.CurrentTab` clamping against the wrong value.
+* Fix culture-based parsing in `TimespanSerializer`.
+* Fixed grid rendering blowing up on tile IDs that aren't registered.
+* Fixed debug assert when loading MIDI soundfonts on Windows.
+* Make `ColorSelectorSliders` properly update the dropdown when changing `SelectorType`.
+* Fixed `tpto` allowing teleports to oneself, thereby causing them to be deleted.
+* Fix OpenAL extensions being requested incorrectly, causing an error on macOS.
+* Fixed horizontal measuring of markup controls in rich text.
+
+### Other
+
+* Improved logging for some audio entity errors.
+* Avoided more server stutters when using `csci`.
+* Improved physics performance.
+* Made various localization functions like `GENDER()` not throw if passed a string instead of an `EntityUid`.
+* The generic clause on `EntitySystem.AddComp<T>` has been changed to `IComponent` (from `Component`) for consistency with `IEntityManager.AddComponent<T>`.
+* `DataDefinitionAnalyzer` has been optimized somewhat.
+* Improved assert logging error message when static data fields are encountered.
+
+### Internal
+
+* Warning cleanup.
+* Added more tests for `DataDefinitionAnalyzer`.
+* Consistently use `EntitySystem` proxy methods in engine.
+
+
+## 262.0.0
+
+### Breaking changes
+
+* Toolshed commands will now validate that each non-generic command argument is parseable (i.e., has a corresponding type parser). This check can be disabled by explicitly marking the argument as unparseable via `CommandArgumentAttribute.Unparseable`.
+
+### New features
+
+* `ToolshedManager.TryParse` now also supports nullable value types.
+* Add an ignoredComponents arg to IsDefault.
+
+### Bugfixes
+
+* Fix `SpriteComponent.Layer.Visible` setter not marking a sprite's bounding box as dirty.
+* The audio params in the passed SoundSpecifier for PlayStatic(SoundSpecifier, Filter, ...) will now be used as a default like other PlayStatic overrides.
+* Fix windows not saving their positions correctly when their x position is <= 0.
+* Fix transform state handling overriding PVS detachment.
+
+
+## 261.2.0
+
+### New features
+
+* Implement IEquatable for ResolvedPathSpecifier & ResolvedCollectionSpecifier.
+* Add NearestChunkEnumerator.
+
+### Bugfixes
+
+* Fix static entities not having the center of mass updated.
+* Fix TryQueueDelete.
+* Fix tpto potentially parenting grids to non-map entities.
+
+### Other
+
+* TileChangedEvent is now raised once in clientside grid state handling rather than per tile.
+* Removed ITileDefinition.ID as it was redundant.
+* Change the lifestage checks on predicted entity deletion to check for terminating.
+
+### Internal
+
+* Update some `GetComponentName<T>` uses to generic.
+
+
+## 261.1.0
+
+### New features
+
+* Automatically create logger sawmills for `UIController`s similar to `EntitySystem`s.
+
+### Bugfixes
+
+* Fix physics forces not auto-clearing / respecting the cvar.
+
+### Internal
+
+* Cleanup more compiler warnings in unit tests.
+
+
+## 261.0.0
+
+### Breaking changes
+
+* Remove unused TryGetContainingContainer override.
+* Stop recursive FrameUpdates for controls that are not visible.
+* Initialize LocMgr earlier in the callstack for GameController.
+* Fix FastNoiseLise fractal bounding and remove its DataField property as it should be derived on other properties updating.
+* Make RaiseMoveEvent internal.
+* MovedGridsComponent and PhysicsMapComponent are now purged and properties on `SharedPhysicsSystem`. Additionally the TransformComponent for Awake entities is stored alongside the PhysicsComponent for them.
+* TransformComponent is now stored on physics contacts.
+* Gravity2DComponent and Gravity2DController were moved to SharedPhysicsSystem.
+
+### New features
+
+* `IFileDialogManager` now allows specifying `FileAccess` and `FileShare` modes.
+* Add Intersects and Enlarged to Box2i in line with Box2.
+* Make `KeyFrame`s on `AnimationTrackProperty` public settable.
+* Add the spawned entities to a returned array from `SpawnEntitiesAttachedTo`.
+
+### Bugfixes
+
+* Fixed SDL3 file dialog implementation having a memory leak and not opening files read-write.
+* Fix GetMapLinearVelocity.
+
+### Other
+
+* `uploadfile` and `loadprototype` commands now only open files with read access.
+* Optimize `ToMapCoordinates`.
+
+### Internal
+
+* Cleanup on internals of `IFileDialogManager`, removing duplicate code.
+* Fix Contacts not correctly being marked as `Touching` while contact is ongoing.
+
+
 ## 260.2.0
 
 ### New features

Resources/Locale/en-US/toolshed-commands.ftl

@@ -195,6 +195,8 @@ command-description-spawn-at =
     Spawns an entity at the given coordinates.
 command-description-spawn-on =
     Spawns an entity on the given entity, at it's coordinates.
+command-description-spawn-in =
+    Spawns an entity in the given container on the given entity, dropping it at its coordinates if it doesn't fit
 command-description-spawn-attached =
     Spawns an entity attached to the given entity, at (0 0) relative to it.
 command-description-mappos =

Robust.Analyzers.Tests/DataDefinitionAnalyzerTest.cs

@@ -55,7 +55,7 @@ public sealed class DataDefinitionAnalyzerTest
         namespace Robust.Shared.Serialization.Manager.Attributes
         {
             public class DataFieldBaseAttribute : Attribute;
-            public class DataFieldAttribute : DataFieldBaseAttribute;
+            public class DataFieldAttribute(string? tag = null) : DataFieldBaseAttribute;
             public sealed class DataDefinitionAttribute : Attribute;
             public sealed class NotYamlSerializableAttribute : Attribute;
         }
@@ -117,6 +117,61 @@ public sealed class DataDefinitionAnalyzerTest
         );
     }
 
+    [Test]
+    public async Task PartialDataDefinitionTest()
+    {
+        const string code = """
+            using Robust.Shared.Serialization.Manager.Attributes;
+
+            [DataDefinition]
+            public sealed class Foo { }
+            """;
+
+        await Verifier(code,
+            // /0/Test0.cs(4,15): error RA0017: Type Foo is a DataDefinition but is not partial
+            VerifyCS.Diagnostic(DataDefinitionAnalyzer.DataDefinitionPartialRule).WithSpan(4, 15, 4, 20).WithArguments("Foo")
+        );
+    }
+
+    [Test]
+    public async Task NestedPartialDataDefinitionTest()
+    {
+        const string code = """
+            using Robust.Shared.Serialization.Manager.Attributes;
+
+            public sealed class Foo
+            {
+                [DataDefinition]
+                public sealed partial class Nested { }
+            }
+            """;
+
+        await Verifier(code,
+            // /0/Test0.cs(3,15): error RA0018: Type Foo contains nested data definition Nested but is not partial
+            VerifyCS.Diagnostic(DataDefinitionAnalyzer.NestedDataDefinitionPartialRule).WithSpan(3, 15, 3, 20).WithArguments("Foo", "Nested")
+        );
+    }
+
+    [Test]
+    public async Task RedundantDataFieldTagTest()
+    {
+        const string code = """
+            using Robust.Shared.Serialization.Manager.Attributes;
+
+            [DataDefinition]
+            public sealed partial class Foo
+            {
+                [DataField("someValue")]
+                public int SomeValue;
+            }
+            """;
+
+        await Verifier(code,
+            // /0/Test0.cs(6,6): info RA0027: Data field SomeValue in data definition Foo has an explicitly set tag that matches autogenerated tag
+            VerifyCS.Diagnostic(DataDefinitionAnalyzer.DataFieldRedundantTagRule).WithSpan(6, 6, 6, 28).WithArguments("SomeValue", "Foo")
+        );
+    }
+
     [Test]
     public async Task ReadOnlyPropertyTest()
     {

Robust.Analyzers/DataDefinitionAnalyzer.cs

@@ -22,7 +22,7 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
     private const string DataFieldAttributeName = "DataField";
     private const string ViewVariablesAttributeName = "ViewVariables";
 
-    private static readonly DiagnosticDescriptor DataDefinitionPartialRule = new(
+    public static readonly DiagnosticDescriptor DataDefinitionPartialRule = new(
         Diagnostics.IdDataDefinitionPartial,
         "Type must be partial",
         "Type {0} is a DataDefinition but is not partial",
@@ -32,7 +32,7 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
         "Make sure to mark any type that is a data definition as partial."
     );
 
-    private static readonly DiagnosticDescriptor NestedDataDefinitionPartialRule = new(
+    public static readonly DiagnosticDescriptor NestedDataDefinitionPartialRule = new(
         Diagnostics.IdNestedDataDefinitionPartial,
         "Type must be partial",
         "Type {0} contains nested data definition {1} but is not partial",
@@ -62,7 +62,7 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
         "Make sure to add a setter."
     );
 
-    private static readonly DiagnosticDescriptor DataFieldRedundantTagRule = new(
+    public static readonly DiagnosticDescriptor DataFieldRedundantTagRule = new(
         Diagnostics.IdDataFieldRedundantTag,
         "Data field has redundant tag specified",
         "Data field {0} in data definition {1} has an explicitly set tag that matches autogenerated tag",
@@ -102,14 +102,23 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
         context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.Analyze | GeneratedCodeAnalysisFlags.None);
         context.EnableConcurrentExecution();
 
-        context.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.ClassDeclaration);
-        context.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.StructDeclaration);
-        context.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.RecordDeclaration);
-        context.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.RecordStructDeclaration);
-        context.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.InterfaceDeclaration);
+        context.RegisterSymbolStartAction(symbolContext =>
+        {
+            if (symbolContext.Symbol is not INamedTypeSymbol typeSymbol)
+                return;
 
-        context.RegisterSyntaxNodeAction(AnalyzeDataField, SyntaxKind.FieldDeclaration);
-        context.RegisterSyntaxNodeAction(AnalyzeDataFieldProperty, SyntaxKind.PropertyDeclaration);
+            if (!IsDataDefinition(typeSymbol))
+                return;
+
+            symbolContext.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.ClassDeclaration);
+            symbolContext.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.StructDeclaration);
+            symbolContext.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.RecordDeclaration);
+            symbolContext.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.RecordStructDeclaration);
+            symbolContext.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.InterfaceDeclaration);
+
+            symbolContext.RegisterSyntaxNodeAction(AnalyzeDataField, SyntaxKind.FieldDeclaration);
+            symbolContext.RegisterSyntaxNodeAction(AnalyzeDataFieldProperty, SyntaxKind.PropertyDeclaration);
+        }, SymbolKind.NamedType);
     }
 
     private void AnalyzeDataDefinition(SyntaxNodeAnalysisContext context)
@@ -117,8 +126,7 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
         if (context.Node is not TypeDeclarationSyntax declaration)
             return;
 
-        var type = context.SemanticModel.GetDeclaredSymbol(declaration)!;
-        if (!IsDataDefinition(type))
+        if (context.ContainingSymbol is not INamedTypeSymbol type)
             return;
 
         if (!IsPartial(declaration))
@@ -129,7 +137,7 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
         var containingType = type.ContainingType;
         while (containingType != null)
         {
-            var containingTypeDeclaration = (TypeDeclarationSyntax) containingType.DeclaringSyntaxReferences[0].GetSyntax();
+            var containingTypeDeclaration = (TypeDeclarationSyntax)containingType.DeclaringSyntaxReferences[0].GetSyntax();
             if (!IsPartial(containingTypeDeclaration))
             {
                 context.ReportDiagnostic(Diagnostic.Create(NestedDataDefinitionPartialRule, containingTypeDeclaration.Keyword.GetLocation(), containingType.Name, type.Name));
@@ -144,27 +152,26 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
         if (context.Node is not FieldDeclarationSyntax field)
             return;
 
-        var typeDeclaration = field.FirstAncestorOrSelf<TypeDeclarationSyntax>();
-        if (typeDeclaration == null)
-            return;
-
-        var type = context.SemanticModel.GetDeclaredSymbol(typeDeclaration)!;
-        if (!IsDataDefinition(type))
+        if (context.ContainingSymbol?.ContainingType is not INamedTypeSymbol type)
             return;
 
         foreach (var variable in field.Declaration.Variables)
         {
             var fieldSymbol = context.SemanticModel.GetDeclaredSymbol(variable);
+
             if (fieldSymbol == null)
                 continue;
 
+            if (!IsDataField(fieldSymbol, out _, out var datafieldAttribute))
+                continue;
+
             if (IsReadOnlyDataField(type, fieldSymbol))
             {
                 TryGetModifierLocation(field, SyntaxKind.ReadOnlyKeyword, out var location);
                 context.ReportDiagnostic(Diagnostic.Create(DataFieldWritableRule, location, fieldSymbol.Name, type.Name));
             }
 
-            if (HasRedundantTag(fieldSymbol))
+            if (HasRedundantTag(fieldSymbol, datafieldAttribute))
             {
                 TryGetAttributeLocation(field, DataFieldAttributeName, out var location);
                 context.ReportDiagnostic(Diagnostic.Create(DataFieldRedundantTagRule, location, fieldSymbol.Name, type.Name));
@@ -196,25 +203,28 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
         if (context.Node is not PropertyDeclarationSyntax property)
             return;
 
-        var typeDeclaration = property.FirstAncestorOrSelf<TypeDeclarationSyntax>();
-        if (typeDeclaration == null)
+        if (context.ContainingSymbol is not IPropertySymbol propertySymbol)
             return;
 
-        var type = context.SemanticModel.GetDeclaredSymbol(typeDeclaration)!;
-        if (!IsDataDefinition(type) || type.IsRecord || type.IsValueType)
+        if (propertySymbol.ContainingType is not INamedTypeSymbol type)
+            return;
+
+        if (type.IsRecord || type.IsValueType)
             return;
 
-        var propertySymbol = context.SemanticModel.GetDeclaredSymbol(property);
         if (propertySymbol == null)
             return;
 
+        if (!IsDataField(propertySymbol, out _, out var datafieldAttribute))
+            return;
+
         if (IsReadOnlyDataField(type, propertySymbol))
         {
             var location = property.AccessorList != null ? property.AccessorList.GetLocation() : property.GetLocation();
             context.ReportDiagnostic(Diagnostic.Create(DataFieldPropertyWritableRule, location, propertySymbol.Name, type.Name));
         }
 
-        if (HasRedundantTag(propertySymbol))
+        if (HasRedundantTag(propertySymbol, datafieldAttribute))
         {
             TryGetAttributeLocation(property, DataFieldAttributeName, out var location);
             context.ReportDiagnostic(Diagnostic.Create(DataFieldRedundantTagRule, location, propertySymbol.Name, type.Name));
@@ -242,9 +252,6 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
 
     private static bool IsReadOnlyDataField(ITypeSymbol type, ISymbol field)
     {
-        if (!IsDataField(field, out _, out _))
-            return false;
-
         return IsReadOnlyMember(type, field);
     }
 
@@ -369,17 +376,14 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
         return false;
     }
 
-    private static bool HasRedundantTag(ISymbol symbol)
+    private static bool HasRedundantTag(ISymbol symbol, AttributeData datafieldAttribute)
     {
-        if (!IsDataField(symbol, out var _, out var attribute))
-            return false;
-
         // No args, no problem
-        if (attribute.ConstructorArguments.Length == 0)
+        if (datafieldAttribute.ConstructorArguments.Length == 0)
             return false;
 
         // If a tag is explicitly specified, it will be the first argument...
-        var tagArgument = attribute.ConstructorArguments[0];
+        var tagArgument = datafieldAttribute.ConstructorArguments[0];
         // ...but the first arg could also something else, since tag is optional
         // so we make sure that it's a string
         if (tagArgument.Value is not string explicitName)
@@ -394,9 +398,6 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
 
     private static bool HasVVReadWrite(ISymbol symbol)
     {
-        if (!IsDataField(symbol, out _, out _))
-            return false;
-
         // Make sure it has ViewVariablesAttribute
         AttributeData? viewVariablesAttribute = null;
         foreach (var attr in symbol.GetAttributes())
@@ -422,9 +423,6 @@ public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
 
     private static bool IsNotYamlSerializable(ISymbol field, ITypeSymbol type)
     {
-        if (!IsDataField(field, out _, out _))
-            return false;
-
         return HasAttribute(type, NotYamlSerializableName);
     }
 

Robust.Client.WebView/Cef/Program.cs

@@ -6,7 +6,7 @@ using Xilium.CefGlue;
 
 namespace Robust.Client.WebView.Cef
 {
-    public static class Program
+    internal static class Program
     {
         // This was supposed to be the main entry for the subprocess program... It doesn't work.
         public static int Main(string[] args)

Robust.Client.WebView/Cef/WebViewManagerCef.cs

@@ -5,6 +5,7 @@ using System.Net;
 using System.Reflection;
 using System.Text;
 using Robust.Client.Console;
+using Robust.Client.Utility;
 using Robust.Shared.Configuration;
 using Robust.Shared.ContentPack;
 using Robust.Shared.IoC;
@@ -24,6 +25,7 @@ namespace Robust.Client.WebView.Cef
 
         [Dependency] private readonly IDependencyCollection _dependencyCollection = default!;
         [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
+        [Dependency] private readonly IGameControllerInternal _gameController = default!;
         [Dependency] private readonly IResourceManagerInternal _resourceManager = default!;
         [Dependency] private readonly IClientConsoleHost _consoleHost = default!;
         [Dependency] private readonly IConfigurationManager _cfg = default!;
@@ -61,7 +63,10 @@ namespace Robust.Client.WebView.Cef
 
             var cachePath = "";
             if (_resourceManager.UserData is WritableDirProvider userData)
-                cachePath = userData.GetFullPath(new ResPath("/cef_cache"));
+            {
+                var rootDir = UserDataDir.GetRootUserDataDir(_gameController);
+                cachePath = Path.Combine(rootDir, "cef_cache", "0");
+            }
 
             var settings = new CefSettings()
             {

Robust.Client/Animations/AnimationTrackProperty.cs

@@ -13,7 +13,7 @@ namespace Robust.Client.Animations
     /// </summary>
     public abstract class AnimationTrackProperty : AnimationTrack
     {
-        public List<KeyFrame> KeyFrames { get; protected set; } = new();
+        public List<KeyFrame> KeyFrames { get; set; } = new();
 
         /// <summary>
         ///     How to interpolate values when between two keyframes.

Robust.Client/Audio/AudioManager.cs

@@ -57,8 +57,8 @@ internal sealed partial class AudioManager : IAudioInternal
         _checkAlError();
 
         // Load up AL context extensions.
-        var s = ALC.GetString(ALDevice.Null, AlcGetString.Extensions) ?? "";
-        foreach (var extension in s.Split(' '))
+        var s = ALC.GetString(_openALDevice, AlcGetString.Extensions) ?? "";
+        foreach (var extension in s.Split(' ', StringSplitOptions.RemoveEmptyEntries))
         {
             _alContextExtensions.Add(extension);
         }

Robust.Client/Audio/AudioSystem.cs

@@ -582,7 +582,7 @@ public sealed partial class AudioSystem : SharedAudioSystem
     {
         if (TerminatingOrDeleted(entity))
         {
-            Log.Error($"Tried to play coordinates audio on a terminating / deleted entity {ToPrettyString(entity)}");
+            LogAudioPlaybackOnInvalidEntity(specifier, entity);
             return null;
         }
 
@@ -626,7 +626,7 @@ public sealed partial class AudioSystem : SharedAudioSystem
     {
         if (TerminatingOrDeleted(coordinates.EntityId))
         {
-            Log.Error($"Tried to play coordinates audio on a terminating / deleted entity {ToPrettyString(coordinates.EntityId)}");
+            LogAudioPlaybackOnInvalidEntity(specifier, coordinates.EntityId);
             return null;
         }
 
@@ -753,6 +753,12 @@ public sealed partial class AudioSystem : SharedAudioSystem
         return _resourceCache.GetResource<AudioResource>(filename).AudioStream.Length;
     }
 
+    private void LogAudioPlaybackOnInvalidEntity(ResolvedSoundSpecifier? specifier, EntityUid entityId)
+    {
+        var soundInfo = specifier?.ToString() ?? "unknown sound";
+        Log.Error($"Tried to play coordinates audio on a terminating / deleted entity {ToPrettyString(entityId)}. Sound: {soundInfo}. Trace: {Environment.StackTrace}");
+    }
+
     #region Jobs
 
     private record struct UpdateAudioJob : IParallelRobustJob

Robust.Client/Audio/Midi/IMidiRenderer.cs

@@ -6,6 +6,7 @@ using Robust.Shared.Audio.Midi;
 using Robust.Shared.Audio.Sources;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Map;
+using Robust.Shared.Utility;
 
 namespace Robust.Client.Audio.Midi;
 
@@ -156,8 +157,13 @@ public interface IMidiRenderer : IDisposable
     /// <summary>
     ///     Loads a new soundfont into the renderer.
     /// </summary>
+    [Obsolete("Use LoadSoundfontResource or LoadSoundfontUser instead")]
     void LoadSoundfont(string filename, bool resetPresets = false);
 
+    void LoadSoundfontResource(ResPath path, bool resetPresets = false);
+
+    void LoadSoundfontUser(ResPath path, bool resetPresets = false);
+
     /// <summary>
     ///     Invoked whenever a new midi event is registered.
     /// </summary>

Robust.Client/Audio/Midi/MidiManager.SoundFontLoad.cs

@@ -0,0 +1,262 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using NFluidsynth;
+using Robust.Shared.ContentPack;
+using Robust.Shared.Utility;
+
+namespace Robust.Client.Audio.Midi;
+
+internal sealed partial class MidiManager
+{
+    // For loading sound fonts, we have to use a callback model where we can only parse a string.
+    // This API, frankly, fucking sucks.
+    //
+    // These prefixes are used to separate the various places a file *can* be loaded from.
+    //
+    // We cannot prevent Fluidsynth from trying to load prefixed paths itself if they are invalid
+    // So if content specifies "/foobar.sf2" to be loaded and it doesn't exist,
+    // Fluidsynth *will* try to fopen("RES:/foobar.sf2"). For this reason I'm putting in some nonsense characters
+    // that will pass through Fluidsynth fine, but make sure the filename is *never* a practically valid OS path.
+    //
+    // NOTE: Raw disk paths *cannot* be prefixed as Fluidsynth needs to load those itself.
+    // Specifically, their .dls loader doesn't respect file callbacks.
+    // If you're curious why this is: it's two-fold:
+    // * The Fluidsynth C code for the .dls loader just doesn't use the file callbacks, period.
+    // * Even if it did, we're not specifying those file callbacks, as they're per loader,
+    //   and we're only adding a *new* sound font loader with file callbacks, not modifying the existing ones.
+    //   The loader for .sfX format and .dls format are different loader objects in Fluidsynth.
+    internal const string PrefixCommon = "!/ -?\x0001";
+    internal const string PrefixLegacy = PrefixCommon + "LEGACY";
+    internal const string PrefixUser = PrefixCommon + "USER";
+    internal const string PrefixResources = PrefixCommon + "RES";
+
+    private void LoadSoundFontSetup(MidiRenderer renderer)
+    {
+        _midiSawmill.Debug($"Loading fallback soundfont {FallbackSoundfont}");
+        // Since the last loaded soundfont takes priority, we load the fallback soundfont before the soundfont.
+        renderer.LoadSoundfontResource(FallbackSoundfont);
+
+        // Load system-specific soundfonts.
+        if (OperatingSystem.IsLinux())
+        {
+            foreach (var filepath in LinuxSoundfonts)
+            {
+                if (!File.Exists(filepath) || !SoundFont.IsSoundFont(filepath))
+                    continue;
+
+                try
+                {
+                    _midiSawmill.Debug($"Loading OS soundfont {filepath}");
+                    renderer.LoadSoundfontDisk(filepath);
+                }
+                catch (Exception)
+                {
+                    continue;
+                }
+
+                break;
+            }
+        }
+        else if (OperatingSystem.IsMacOS())
+        {
+            if (File.Exists(OsxSoundfont) && SoundFont.IsSoundFont(OsxSoundfont))
+            {
+                _midiSawmill.Debug($"Loading OS soundfont {OsxSoundfont}");
+                renderer.LoadSoundfontDisk(OsxSoundfont);
+            }
+        }
+        else if (OperatingSystem.IsWindows())
+        {
+            if (File.Exists(WindowsSoundfont) && SoundFont.IsSoundFont(WindowsSoundfont))
+            {
+                _midiSawmill.Debug($"Loading OS soundfont {WindowsSoundfont}");
+                renderer.LoadSoundfontDisk(WindowsSoundfont);
+            }
+        }
+
+        // Maybe load soundfont specified in environment variable.
+        // Load it here so it can override system soundfonts but not content or user data soundfonts.
+        if (Environment.GetEnvironmentVariable(SoundfontEnvironmentVariable) is { } soundfontOverride)
+        {
+            // Just to avoid funny shit: avoid people smuggling a prefix in here.
+            // I wish I could separate this properly...
+            var (prefix, _) = SplitPrefix(soundfontOverride);
+            if (IsValidPrefix(prefix))
+            {
+                _midiSawmill.Error($"Not respecting {SoundfontEnvironmentVariable} env variable: invalid file path");
+            }
+            else if (File.Exists(soundfontOverride) && SoundFont.IsSoundFont(soundfontOverride))
+            {
+                _midiSawmill.Debug($"Loading environment variable soundfont {soundfontOverride}");
+                renderer.LoadSoundfontDisk(soundfontOverride);
+            }
+        }
+
+        // Load content-specific custom soundfonts, which should override the system/fallback soundfont.
+        _midiSawmill.Debug($"Loading soundfonts from content directory {ContentCustomSoundfontDirectory}");
+        foreach (var file in _resourceManager.ContentFindFiles(ContentCustomSoundfontDirectory))
+        {
+            if (file.Extension != "sf2" && file.Extension != "dls" && file.Extension != "sf3") continue;
+            _midiSawmill.Debug($"Loading content soundfont {file}");
+            renderer.LoadSoundfontResource(file);
+        }
+
+        // Load every soundfont from the user data directory last, since those may override any other soundfont.
+        _midiSawmill.Debug($"Loading soundfonts from user data directory {CustomSoundfontDirectory}");
+        var enumerator = _resourceManager.UserData.Find($"{CustomSoundfontDirectory.ToRelativePath()}*").Item1;
+        foreach (var file in enumerator)
+        {
+            if (file.Extension != "sf2" && file.Extension != "dls" && file.Extension != "sf3") continue;
+            _midiSawmill.Debug($"Loading user soundfont {file}");
+            renderer.LoadSoundfontUser(file);
+        }
+    }
+
+    internal static string PrefixPath(string prefix, string value)
+    {
+        return $"{prefix}:{value}";
+    }
+
+    internal static (string prefix, string? value) SplitPrefix(string filename)
+    {
+        var filenameSplit = filename.Split(':', 2);
+        if (filenameSplit.Length == 1)
+            return (filenameSplit[0], null);
+
+        return (filenameSplit[0], filenameSplit[1]);
+    }
+
+    internal static bool IsValidPrefix(string prefix)
+    {
+        return prefix is PrefixLegacy or PrefixUser or PrefixResources;
+    }
+
+    /// <summary>
+    ///     This class is used to load soundfonts.
+    /// </summary>
+    private sealed class ResourceLoaderCallbacks : SoundFontLoaderCallbacks
+    {
+        private readonly MidiManager _parent;
+        private readonly Dictionary<int, Stream> _openStreams = new();
+        private int _nextStreamId = 1;
+
+        public ResourceLoaderCallbacks(MidiManager parent)
+        {
+            _parent = parent;
+        }
+
+        public override IntPtr Open(string filename)
+        {
+            if (string.IsNullOrEmpty(filename))
+            {
+                return IntPtr.Zero;
+            }
+
+            Stream stream;
+            try
+            {
+                stream = OpenCore(filename);
+            }
+            catch (Exception e)
+            {
+                _parent._midiSawmill.Error($"Error while opening sound font: {e}");
+                return IntPtr.Zero;
+            }
+
+            var id = _nextStreamId++;
+
+            _openStreams.Add(id, stream);
+
+            return (IntPtr) id;
+        }
+
+        private Stream OpenCore(string filename)
+        {
+            var (prefix, value) = SplitPrefix(filename);
+
+            if (!IsValidPrefix(prefix) || value == null)
+                return File.OpenRead(filename);
+
+            var resourceCache = _parent._resourceManager;
+            var resourcePath = new ResPath(value);
+
+            switch (prefix)
+            {
+                case PrefixUser:
+                    return resourceCache.UserData.OpenRead(resourcePath);
+                case PrefixResources:
+                    return resourceCache.ContentFileRead(resourcePath);
+                case PrefixLegacy:
+                    // Try resources first, then try user data.
+                    if (resourceCache.TryContentFileRead(resourcePath, out var stream))
+                        return stream;
+
+                    return resourceCache.UserData.OpenRead(resourcePath);
+                default:
+                    throw new UnreachableException("Invalid prefix specified!");
+            }
+        }
+
+        public override unsafe int Read(IntPtr buf, long count, IntPtr sfHandle)
+        {
+            var length = (int) count;
+            var span = new Span<byte>(buf.ToPointer(), length);
+            var stream = _openStreams[(int) sfHandle];
+
+            // Fluidsynth's docs state that this method should leave the buffer unmodified if it fails. (returns -1)
+            try
+            {
+                // Fluidsynth does a LOT of tiny allocations (frankly, way too much).
+                if (count < 1024)
+                {
+                    // ReSharper disable once SuggestVarOrType_Elsewhere
+                    Span<byte> buffer = stackalloc byte[(int)count];
+
+                    stream.ReadExact(buffer);
+
+                    buffer.CopyTo(span);
+                }
+                else
+                {
+                    var buffer = stream.ReadExact(length);
+
+                    buffer.CopyTo(span);
+                }
+            }
+            catch (EndOfStreamException)
+            {
+                return -1;
+            }
+
+            return 0;
+        }
+
+        public override int Seek(IntPtr sfHandle, long offset, SeekOrigin origin)
+        {
+            var stream = _openStreams[(int) sfHandle];
+
+            stream.Seek(offset, origin);
+
+            return 0;
+        }
+
+        public override long Tell(IntPtr sfHandle)
+        {
+            var stream = _openStreams[(int) sfHandle];
+
+            return (long) stream.Position;
+        }
+
+        public override int Close(IntPtr sfHandle)
+        {
+            if (!_openStreams.Remove((int) sfHandle, out var stream))
+                return -1;
+
+            stream.Dispose();
+            return 0;
+
+        }
+    }
+}

Robust.Client/Audio/Midi/MidiManager.cs

@@ -119,7 +119,7 @@ internal sealed partial class MidiManager : IMidiManager
     private const string OsxSoundfont =
         "/System/Library/Components/CoreAudio.component/Contents/Resources/gs_instruments.dls";
 
-    private const string FallbackSoundfont = "/Midi/fallback.sf2";
+    private static readonly ResPath FallbackSoundfont = new ResPath("/Midi/fallback.sf2");
 
     private const string ContentCustomSoundfontDirectory = "/Audio/MidiCustom/";
 
@@ -265,81 +265,7 @@ internal sealed partial class MidiManager : IMidiManager
 
             var renderer = new MidiRenderer(_settings!, soundfontLoader, mono, this, _audio, _taskManager, _midiSawmill);
 
-            _midiSawmill.Debug($"Loading fallback soundfont {FallbackSoundfont}");
-            // Since the last loaded soundfont takes priority, we load the fallback soundfont before the soundfont.
-            renderer.LoadSoundfont(FallbackSoundfont);
-
-            // Load system-specific soundfonts.
-            if (OperatingSystem.IsLinux())
-            {
-                foreach (var filepath in LinuxSoundfonts)
-                {
-                    if (!File.Exists(filepath) || !SoundFont.IsSoundFont(filepath))
-                        continue;
-
-                    try
-                    {
-                        _midiSawmill.Debug($"Loading OS soundfont {filepath}");
-                        renderer.LoadSoundfont(filepath);
-                    }
-                    catch (Exception)
-                    {
-                        continue;
-                    }
-
-                    break;
-                }
-            }
-            else if (OperatingSystem.IsMacOS())
-            {
-                if (File.Exists(OsxSoundfont) && SoundFont.IsSoundFont(OsxSoundfont))
-                {
-                    _midiSawmill.Debug($"Loading OS soundfont {OsxSoundfont}");
-                    renderer.LoadSoundfont(OsxSoundfont);
-                }
-            }
-            else if (OperatingSystem.IsWindows())
-            {
-                if (File.Exists(WindowsSoundfont) && SoundFont.IsSoundFont(WindowsSoundfont))
-                {
-                    _midiSawmill.Debug($"Loading OS soundfont {WindowsSoundfont}");
-                    renderer.LoadSoundfont(WindowsSoundfont);
-                }
-            }
-
-            // Maybe load soundfont specified in environment variable.
-            // Load it here so it can override system soundfonts but not content or user data soundfonts.
-            if (Environment.GetEnvironmentVariable(SoundfontEnvironmentVariable) is {} soundfontOverride)
-            {
-                if (File.Exists(soundfontOverride) && SoundFont.IsSoundFont(soundfontOverride))
-                {
-                    _midiSawmill.Debug($"Loading environment variable soundfont {soundfontOverride}");
-                    renderer.LoadSoundfont(soundfontOverride);
-                }
-            }
-
-            // Load content-specific custom soundfonts, which should override the system/fallback soundfont.
-            _midiSawmill.Debug($"Loading soundfonts from content directory {ContentCustomSoundfontDirectory}");
-            foreach (var file in _resourceManager.ContentFindFiles(ContentCustomSoundfontDirectory))
-            {
-                if (file.Extension != "sf2" && file.Extension != "dls" && file.Extension != "sf3") continue;
-                _midiSawmill.Debug($"Loading content soundfont {file}");
-                renderer.LoadSoundfont(file.ToString());
-            }
-
-            var userDataPath = _resourceManager.UserData.RootDir == null
-                ? CustomSoundfontDirectory
-                : new ResPath(_resourceManager.UserData.RootDir) / CustomSoundfontDirectory.ToRelativePath();
-
-            // Load every soundfont from the user data directory last, since those may override any other soundfont.
-            _midiSawmill.Debug($"Loading soundfonts from user data directory {userDataPath}");
-            var enumerator = _resourceManager.UserData.Find($"{CustomSoundfontDirectory.ToRelativePath()}*").Item1;
-            foreach (var file in enumerator)
-            {
-                if (file.Extension != "sf2" && file.Extension != "dls" && file.Extension != "sf3") continue;
-                _midiSawmill.Debug($"Loading user soundfont {file}");
-                renderer.LoadSoundfont(file.ToString());
-            }
+            LoadSoundFontSetup(renderer);
 
             renderer.Source.Gain = _gain;
 
@@ -572,130 +498,6 @@ internal sealed partial class MidiManager : IMidiManager
             midiEvent.Velocity);
     }
 
-    /// <summary>
-    ///     This class is used to load soundfonts.
-    /// </summary>
-    private sealed class ResourceLoaderCallbacks : SoundFontLoaderCallbacks
-    {
-        private readonly MidiManager _parent;
-        private readonly Dictionary<int, Stream> _openStreams = new();
-        private int _nextStreamId = 1;
-
-        public ResourceLoaderCallbacks(MidiManager parent)
-        {
-            _parent = parent;
-        }
-
-        public override IntPtr Open(string filename)
-        {
-            if (string.IsNullOrEmpty(filename))
-            {
-                return IntPtr.Zero;
-            }
-
-            Stream? stream;
-            var resourceCache = _parent._resourceManager;
-            var resourcePath = new ResPath(filename);
-
-            if (resourcePath.IsRooted)
-            {
-                // is it in content?
-                if (resourceCache.ContentFileExists(filename))
-                {
-                    if (!resourceCache.TryContentFileRead(filename, out stream))
-                        return IntPtr.Zero;
-                }
-                // is it in userdata?
-                else if (resourceCache.UserData.Exists(resourcePath))
-                {
-                    stream = resourceCache.UserData.OpenRead(resourcePath);
-                }
-                else if (File.Exists(filename))
-                {
-                    stream = File.OpenRead(filename);
-                }
-                else
-                {
-                    return IntPtr.Zero;
-                }
-            }
-            else if (File.Exists(filename))
-            {
-                stream = File.OpenRead(filename);
-            }
-            else
-            {
-                return IntPtr.Zero;
-            }
-
-            var id = _nextStreamId++;
-
-            _openStreams.Add(id, stream);
-
-            return (IntPtr) id;
-        }
-
-        public override unsafe int Read(IntPtr buf, long count, IntPtr sfHandle)
-        {
-            var length = (int) count;
-            var span = new Span<byte>(buf.ToPointer(), length);
-            var stream = _openStreams[(int) sfHandle];
-
-            // Fluidsynth's docs state that this method should leave the buffer unmodified if it fails. (returns -1)
-            try
-            {
-                // Fluidsynth does a LOT of tiny allocations (frankly, way too much).
-                if (count < 1024)
-                {
-                    // ReSharper disable once SuggestVarOrType_Elsewhere
-                    Span<byte> buffer = stackalloc byte[(int)count];
-
-                    stream.ReadExact(buffer);
-
-                    buffer.CopyTo(span);
-                }
-                else
-                {
-                    var buffer = stream.ReadExact(length);
-
-                    buffer.CopyTo(span);
-                }
-            }
-            catch (EndOfStreamException)
-            {
-                return -1;
-            }
-
-            return 0;
-        }
-
-        public override int Seek(IntPtr sfHandle, long offset, SeekOrigin origin)
-        {
-            var stream = _openStreams[(int) sfHandle];
-
-            stream.Seek(offset, origin);
-
-            return 0;
-        }
-
-        public override long Tell(IntPtr sfHandle)
-        {
-            var stream = _openStreams[(int) sfHandle];
-
-            return (long) stream.Position;
-        }
-
-        public override int Close(IntPtr sfHandle)
-        {
-            if (!_openStreams.Remove((int) sfHandle, out var stream))
-                return -1;
-
-            stream.Dispose();
-            return 0;
-
-        }
-    }
-
     #region Jobs
 
     private record struct MidiUpdateJob : IParallelRobustJob

Robust.Client/Audio/Midi/MidiRenderer.SoundFontLoad.cs

@@ -0,0 +1,45 @@
+using System;
+using Robust.Shared.Utility;
+
+namespace Robust.Client.Audio.Midi;
+
+internal sealed partial class MidiRenderer
+{
+    [Obsolete("Use LoadSoundfontResource or LoadSoundfontUser instead")]
+    public void LoadSoundfont(string filename, bool resetPresets = true)
+    {
+        LoadSoundfontCore(
+            MidiManager.PrefixPath(MidiManager.PrefixLegacy, filename),
+            resetPresets);
+    }
+
+    public void LoadSoundfontResource(ResPath path, bool resetPresets = false)
+    {
+        LoadSoundfontCore(
+            MidiManager.PrefixPath(MidiManager.PrefixResources, path.ToString()),
+            resetPresets);
+    }
+
+    public void LoadSoundfontUser(ResPath path, bool resetPresets = false)
+    {
+        LoadSoundfontCore(
+            MidiManager.PrefixPath(MidiManager.PrefixUser, path.ToString()),
+            resetPresets);
+    }
+
+    internal void LoadSoundfontDisk(string path, bool resetPresets = false)
+    {
+        LoadSoundfontCore(
+            path,
+            resetPresets);
+    }
+
+    private void LoadSoundfontCore(string filenameString, bool resetPresets)
+    {
+        lock (_playerStateLock)
+        {
+            _synth.LoadSoundFont(filenameString, resetPresets);
+            MidiSoundfont = 1;
+        }
+    }
+}

Robust.Client/Audio/Midi/MidiRenderer.cs

@@ -16,7 +16,7 @@ using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.Audio.Midi;
 
-internal sealed class MidiRenderer : IMidiRenderer
+internal sealed partial class MidiRenderer : IMidiRenderer
 {
     private readonly IMidiManager _midiManager;
     private readonly ITaskManager _taskManager;
@@ -435,15 +435,6 @@ internal sealed class MidiRenderer : IMidiRenderer
         _sequencer.RemoveEvents(SequencerClientId.Wildcard, SequencerClientId.Wildcard, -1);
     }
 
-    public void LoadSoundfont(string filename, bool resetPresets = true)
-    {
-        lock (_playerStateLock)
-        {
-            _synth.LoadSoundFont(filename, resetPresets);
-            MidiSoundfont = 1;
-        }
-    }
-
     void IMidiRenderer.Render()
     {
         Render();

Robust.Client/ComponentTrees/SpriteTreeSystem.cs

@@ -21,7 +21,7 @@ public sealed class SpriteTreeSystem : ComponentTreeSystem<SpriteTreeComponent,
     protected override Box2 ExtractAabb(in ComponentTreeEntry<SpriteComponent> entry, Vector2 pos, Angle rot)
     {
         // TODO SPRITE optimize this
-        // Because the just take the BB of the rotated BB, I'mt pretty sure we do a lot of unnecessary maths.
+        // Because the just take the BB of the rotated BB, I'm pretty sure we do a lot of unnecessary maths.
         return _sprite.CalculateBounds((entry.Uid, entry.Component), pos, rot, default).CalcBoundingBox();
     }
 

Robust.Client/Console/ClientConsoleHost.cs

@@ -191,8 +191,16 @@ namespace Robust.Client.Console
             var shell = new ConsoleShell(this, session ?? _player.LocalSession, session == null);
             var cmdArgs = args.ToArray();
 
-            AnyCommandExecuted?.Invoke(shell, commandName, command, cmdArgs);
-            cmd.Execute(shell, command, cmdArgs);
+            try
+            {
+                AnyCommandExecuted?.Invoke(shell, commandName, command, cmdArgs);
+                cmd.Execute(shell, command, cmdArgs);
+            }
+            catch (Exception e)
+            {
+                _conLogger.Error($"ExecuteError - {command}:\n{e}");
+                shell.WriteError($"There was an error while executing the command: {e}");
+            }
         }
 
         private bool CanExecute(string cmdName)

Robust.Client/Debugging/DebugAnchoringSystem.cs

@@ -82,7 +82,7 @@ namespace Robust.Client.Debugging
 
             foreach (var ent in _mapSystem.GetAnchoredEntities(gridUid, grid, spot))
             {
-                if (EntityManager.TryGetComponent<MetaDataComponent>(ent, out var meta))
+                if (TryComp<MetaDataComponent>(ent, out var meta))
                 {
                     text.AppendLine($"uid: {ent}, {meta.EntityName}");
                 }

Robust.Client/GameController/GameController.cs

@@ -160,6 +160,7 @@ namespace Robust.Client
             }
 
             _serializationManager.Initialize();
+            _loc.Initialize();
 
             // Call Init in game assemblies.
             _modLoader.BroadcastRunLevel(ModRunLevel.PreInit);
@@ -182,7 +183,6 @@ namespace Robust.Client
             _serializer.Initialize();
             _inputManager.Initialize();
             _console.Initialize();
-            _loc.Initialize();
 
             // Make sure this is done before we try to load prototypes,
             // avoid any possibility of race conditions causing the check to not finish
@@ -387,7 +387,7 @@ namespace Robust.Client
 
             _prof.Initialize();
 
-            _resManager.Initialize(Options.LoadConfigAndUserData ? userDataDir : null);
+            _resManager.Initialize(Options.LoadConfigAndUserData ? userDataDir : null, hideUserDataDir: true);
 
             var mountOptions = _commandLineArgs != null
                 ? MountOptions.Merge(_commandLineArgs.MountOptions, Options.MountOptions)

Robust.Client/GameObjects/ClientEntityManager.cs

@@ -296,7 +296,7 @@ namespace Robust.Client.GameObjects
         public override void PredictedDeleteEntity(Entity<MetaDataComponent?, TransformComponent?> ent)
         {
             if (!MetaQuery.Resolve(ent.Owner, ref ent.Comp1)
-                || ent.Comp1.EntityDeleted
+                || ent.Comp1.EntityLifeStage >= EntityLifeStage.Terminating
                 || !TransformQuery.Resolve(ent.Owner, ref ent.Comp2))
             {
                 return;
@@ -322,7 +322,7 @@ namespace Robust.Client.GameObjects
         {
             if (IsQueuedForDeletion(ent.Owner)
                 || !MetaQuery.Resolve(ent.Owner, ref ent.Comp1)
-                || ent.Comp1.EntityDeleted
+                || ent.Comp1.EntityLifeStage >= EntityLifeStage.Terminating
                 || !TransformQuery.Resolve(ent.Owner, ref ent.Comp2))
             {
                 return;

Robust.Client/GameObjects/Components/Renderable/SpriteBoundsOverlay.cs

@@ -24,9 +24,7 @@ namespace Robust.Client.GameObjects
 
     public sealed class SpriteBoundsSystem : EntitySystem
     {
-        [Dependency] private readonly SharedTransformSystem _xformSystem = default!;
         [Dependency] private readonly IOverlayManager _overlayManager = default!;
-        [Dependency] private readonly SpriteTreeSystem _spriteTree = default!;
 
         private SpriteBoundsOverlay? _overlay;
 
@@ -42,7 +40,7 @@ namespace Robust.Client.GameObjects
                 if (_enabled)
                 {
                     DebugTools.AssertNull(_overlay);
-                    _overlay = new SpriteBoundsOverlay(_spriteTree, _xformSystem);
+                    _overlay = new SpriteBoundsOverlay(EntityManager);
                     _overlayManager.AddOverlay(_overlay);
                 }
                 else
@@ -57,18 +55,13 @@ namespace Robust.Client.GameObjects
         private bool _enabled;
     }
 
-    public sealed class SpriteBoundsOverlay : Overlay
+    public sealed class SpriteBoundsOverlay(IEntityManager entMan) : Overlay
     {
         public override OverlaySpace Space => OverlaySpace.WorldSpace;
 
-        private readonly SharedTransformSystem _xformSystem;
-        private SpriteTreeSystem _renderTree;
-
-        public SpriteBoundsOverlay(SpriteTreeSystem renderTree, SharedTransformSystem xformSystem)
-        {
-            _renderTree = renderTree;
-            _xformSystem = xformSystem;
-        }
+        private readonly SharedTransformSystem _xformSystem = entMan.System<SharedTransformSystem>();
+        private readonly SpriteSystem _spriteSystem = entMan.System<SpriteSystem>();
+        private readonly SpriteTreeSystem _renderTree = entMan.System<SpriteTreeSystem>();
 
         protected internal override void Draw(in OverlayDrawArgs args)
         {
@@ -76,10 +69,11 @@ namespace Robust.Client.GameObjects
             var currentMap = args.MapId;
             var viewport = args.WorldBounds;
 
-            foreach (var (sprite, xform) in _renderTree.QueryAabb(currentMap, viewport))
+            foreach (var entry in _renderTree.QueryAabb(currentMap, viewport))
             {
+                var (sprite, xform) = entry;
                 var (worldPos, worldRot) = _xformSystem.GetWorldPositionRotation(xform);
-                var bounds = sprite.CalculateRotatedBoundingBox(worldPos, worldRot, args.Viewport.Eye?.Rotation ?? default);
+                var bounds = _spriteSystem.CalculateBounds((entry.Uid, sprite), worldPos, worldRot, args.Viewport.Eye?.Rotation ?? default);
 
                 // Get scaled down bounds used to indicate the "south" of a sprite.
                 var localBound = bounds.Box;

Robust.Client/GameObjects/Components/Renderable/SpriteComponent.cs

@@ -1224,6 +1224,8 @@ namespace Robust.Client.GameObjects
                         return;
                     _visible = value;
 
+                    Owner.Comp.BoundsDirty = true;
+
                     // ReSharper disable once ConditionalAccessQualifierIsNonNullableAccordingToAPIContract
                     if (_parent.Owner != EntityUid.Invalid)
                         Owner.Comp.Sys?.QueueUpdateIsInert(Owner);
@@ -1791,76 +1793,15 @@ namespace Robust.Client.GameObjects
         [Obsolete("Use SpriteSystem.GetPrototypeTextures() instead")]
         public static IEnumerable<IDirectionalTextureProvider> GetPrototypeTextures(EntityPrototype prototype, IResourceCache resourceCache, out bool noRot)
         {
-            var results = new List<IDirectionalTextureProvider>();
-            noRot = false;
-
-            // TODO when moving to a non-static method in a system, pass in IComponentFactory
-            if (prototype.TryGetComponent(out IconComponent? icon))
-            {
-                var sys = IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<SpriteSystem>();
-                results.Add(sys.GetIcon(icon));
-                return results;
-            }
-
-            if (!prototype.Components.TryGetValue("Sprite", out _))
-            {
-                results.Add(resourceCache.GetFallback<TextureResource>().Texture);
-                return results;
-            }
-
-            var entityManager = IoCManager.Resolve<IEntityManager>();
-            var dummy = entityManager.SpawnEntity(prototype.ID, MapCoordinates.Nullspace);
-            var spriteComponent = entityManager.EnsureComponent<SpriteComponent>(dummy);
-            EntitySystem.Get<AppearanceSystem>().OnChangeData(dummy, spriteComponent);
-
-            foreach (var layer in spriteComponent.AllLayers)
-            {
-                if (!layer.Visible) continue;
-
-                if (layer.Texture != null)
-                {
-                    results.Add(layer.Texture);
-                    continue;
-                }
-
-                if (!layer.RsiState.IsValid) continue;
-
-                var rsi = layer.Rsi ?? spriteComponent.BaseRSI;
-                if (rsi == null ||
-                    !rsi.TryGetState(layer.RsiState, out var state))
-                    continue;
-
-                results.Add(state);
-            }
-
-            noRot = spriteComponent.NoRotation;
-
-            entityManager.DeleteEntity(dummy);
-
-            if (results.Count == 0)
-                results.Add(resourceCache.GetFallback<TextureResource>().Texture);
-
-            return results;
+            var sys = IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<SpriteSystem>();
+            return sys.GetPrototypeTextures(prototype, out noRot);
         }
 
         [Obsolete("Use SpriteSystem.GetPrototypeIcon() instead")]
         public static IRsiStateLike GetPrototypeIcon(EntityPrototype prototype, IResourceCache resourceCache)
         {
             var sys = IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<SpriteSystem>();
-            // TODO when moving to a non-static method in a system, pass in IComponentFactory
-            if (prototype.TryGetComponent(out IconComponent? icon))
-                return sys.GetIcon(icon);
-
-            if (!prototype.Components.ContainsKey("Sprite"))
-                return sys.GetFallbackState();
-
-            var entityManager = IoCManager.Resolve<IEntityManager>();
-            var dummy = entityManager.SpawnEntity(prototype.ID, MapCoordinates.Nullspace);
-            var spriteComponent = entityManager.EnsureComponent<SpriteComponent>(dummy);
-            var result = spriteComponent.Icon ?? sys.GetFallbackState();
-            entityManager.DeleteEntity(dummy);
-
-            return result;
+            return sys.GetPrototypeIcon(prototype);
         }
     }
 }

Robust.Client/GameObjects/EntitySystems/AnimationPlayerSystem.cs

@@ -97,7 +97,7 @@ namespace Robust.Client.GameObjects
         [Obsolete("Use Play(EntityUid<AnimationPlayerComponent> ent, Animation animation, string key) instead")]
         public void Play(EntityUid uid, AnimationPlayerComponent? component, Animation animation, string key)
         {
-            component ??= EntityManager.EnsureComponent<AnimationPlayerComponent>(uid);
+            component ??= EnsureComp<AnimationPlayerComponent>(uid);
             Play(new Entity<AnimationPlayerComponent>(uid, component), animation, key);
         }
 
@@ -158,7 +158,7 @@ namespace Robust.Client.GameObjects
 
         public bool HasRunningAnimation(EntityUid uid, string key)
         {
-            return EntityManager.TryGetComponent(uid, out AnimationPlayerComponent? component) &&
+            return TryComp(uid, out AnimationPlayerComponent? component) &&
                    component.PlayingAnimations.ContainsKey(key);
         }
 

Robust.Client/GameObjects/EntitySystems/InputSystem.cs

@@ -223,12 +223,12 @@ namespace Robust.Client.GameObjects
 
         private void SetEntityContextActive(IInputManager inputMan, EntityUid entity)
         {
-            if(entity == default || !EntityManager.EntityExists(entity))
+            if(entity == default || !Exists(entity))
                 throw new ArgumentNullException(nameof(entity));
 
-            if (!EntityManager.TryGetComponent(entity, out InputComponent? inputComp))
+            if (!TryComp(entity, out InputComponent? inputComp))
             {
-                _sawmillInputContext.Debug($"AttachedEnt has no InputComponent: entId={entity}, entProto={EntityManager.GetComponent<MetaDataComponent>(entity).EntityPrototype}. Setting default \"{InputContextContainer.DefaultContextName}\" context...");
+                _sawmillInputContext.Debug($"AttachedEnt has no InputComponent: entId={entity}, entProto={Comp<MetaDataComponent>(entity).EntityPrototype}. Setting default \"{InputContextContainer.DefaultContextName}\" context...");
                 inputMan.Contexts.SetActiveContext(InputContextContainer.DefaultContextName);
                 return;
             }
@@ -239,7 +239,7 @@ namespace Robust.Client.GameObjects
             }
             else
             {
-                _sawmillInputContext.Error($"Unknown context: entId={entity}, entProto={EntityManager.GetComponent<MetaDataComponent>(entity).EntityPrototype}, context={inputComp.ContextName}. . Setting default \"{InputContextContainer.DefaultContextName}\" context...");
+                _sawmillInputContext.Error($"Unknown context: entId={entity}, entProto={Comp<MetaDataComponent>(entity).EntityPrototype}, context={inputComp.ContextName}. . Setting default \"{InputContextContainer.DefaultContextName}\" context...");
                 inputMan.Contexts.SetActiveContext(InputContextContainer.DefaultContextName);
             }
         }

Robust.Client/GameObjects/EntitySystems/ShowPlayerVelocityDebugSystem.cs

@@ -51,7 +51,7 @@ public sealed class ShowPlayerVelocityDebugSystem : EntitySystem
 
         var player = _playerManager.LocalEntity;
 
-        if (player == null || !EntityManager.TryGetComponent(player.Value, out PhysicsComponent? body))
+        if (player == null || !TryComp(player.Value, out PhysicsComponent? body))
         {
             _label.Visible = false;
             return;

Robust.Client/GameObjects/EntitySystems/SpriteSystem.Helpers.cs

@@ -56,10 +56,6 @@ public sealed partial class SpriteSystem
     /// </summary>
     public IRsiStateLike GetPrototypeIcon(string prototype)
     {
-        // Check if this prototype has been cached before, and if so return the result.
-        if (_cachedPrototypeIcons.TryGetValue(prototype, out var cachedResult))
-            return cachedResult;
-
         if (!_proto.TryIndex<EntityPrototype>(prototype, out var entityPrototype))
         {
             // The specified prototype doesn't exist, return the fallback "error" sprite.
@@ -67,11 +63,7 @@ public sealed partial class SpriteSystem
             return GetFallbackState();
         }
 
-        // Generate the icon and cache it in case it's ever needed again.
-        var result = GetPrototypeIcon(entityPrototype);
-        _cachedPrototypeIcons[prototype] = result;
-
-        return result;
+        return GetPrototypeIcon(entityPrototype);
     }
 
     /// <summary>
@@ -79,13 +71,19 @@ public sealed partial class SpriteSystem
     ///     This method does NOT cache the result.
     /// </summary>
     public IRsiStateLike GetPrototypeIcon(EntityPrototype prototype)
+    {
+        // This method may spawn & delete an entity to get an accruate RSI state, hence we cache the results
+        if (_cachedPrototypeIcons.TryGetValue(prototype.ID, out var cachedResult))
+            return cachedResult;
+
+        return _cachedPrototypeIcons[prototype.ID] = GetPrototypeIconInternal(prototype);
+    }
+
+    private IRsiStateLike GetPrototypeIconInternal(EntityPrototype prototype)
     {
         // IconComponent takes precedence. If it has a valid icon, return that. Otherwise, continue as normal.
-        if (prototype.Components.TryGetValue("Icon", out var compData)
-            && compData.Component is IconComponent icon)
-        {
+        if (prototype.TryGetComponent(out IconComponent? icon, _factory))
             return GetIcon(icon);
-        }
 
         // If the prototype doesn't have a SpriteComponent, then there's nothing we can do but return the fallback.
         if (!prototype.Components.ContainsKey("Sprite"))
@@ -102,6 +100,63 @@ public sealed partial class SpriteSystem
         return result;
     }
 
+    public IEnumerable<IDirectionalTextureProvider> GetPrototypeTextures(EntityPrototype proto) =>
+        GetPrototypeTextures(proto, out _);
+
+    public IEnumerable<IDirectionalTextureProvider> GetPrototypeTextures(EntityPrototype proto, out bool noRot)
+    {
+        var results = new List<IDirectionalTextureProvider>();
+        noRot = false;
+
+        if (proto.TryGetComponent(out IconComponent? icon, _factory))
+        {
+            results.Add(GetIcon(icon));
+            return results;
+        }
+
+        if (!proto.Components.ContainsKey("Sprite"))
+        {
+            results.Add(_resourceCache.GetFallback<TextureResource>().Texture);
+            return results;
+        }
+
+        var dummy = Spawn(proto.ID, MapCoordinates.Nullspace);
+        var spriteComponent = EnsureComp<SpriteComponent>(dummy);
+
+        // TODO SPRITE is this needed?
+        // And if it is, shouldn't GetPrototypeIconInternal also use this?
+        _appearance.OnChangeData(dummy, spriteComponent);
+
+        foreach (var layer in spriteComponent.AllLayers)
+        {
+            if (!layer.Visible)
+                continue;
+
+            if (layer.Texture != null)
+            {
+                results.Add(layer.Texture);
+                continue;
+            }
+
+            if (!layer.RsiState.IsValid)
+                continue;
+
+            var rsi = layer.Rsi ?? spriteComponent.BaseRSI;
+            if (rsi == null || !rsi.TryGetState(layer.RsiState, out var state))
+                continue;
+
+            results.Add(state);
+        }
+
+        noRot = spriteComponent.NoRotation;
+        Del(dummy);
+
+        if (results.Count == 0)
+            results.Add(_resourceCache.GetFallback<TextureResource>().Texture);
+
+        return results;
+    }
+
     [Pure]
     public RSI.State GetFallbackState()
     {

Robust.Client/GameObjects/EntitySystems/SpriteSystem.cs

@@ -34,8 +34,12 @@ namespace Robust.Client.GameObjects
         [Dependency] private readonly IPrototypeManager _proto = default!;
         [Dependency] private readonly IResourceCache _resourceCache = default!;
         [Dependency] private readonly ILogManager _logManager = default!;
+        [Dependency] private readonly IComponentFactory _factory = default!;
+
+        // Note that any new system dependencies have to be added to RobustUnitTest.BaseSetup()
         [Dependency] private readonly SharedTransformSystem _xforms = default!;
         [Dependency] private readonly SpriteTreeSystem _tree = default!;
+        [Dependency] private readonly AppearanceSystem _appearance = default!;
 
         public static readonly ProtoId<ShaderPrototype> UnshadedId = "unshaded";
         private readonly Queue<SpriteComponent> _inertUpdateQueue = new();

Robust.Client/GameStates/ClientGameStateManager.cs

@@ -631,7 +631,7 @@ namespace Robust.Client.GameStates
                         if (_sawmill.Level <= LogLevel.Debug)
                             _sawmill.Debug($"  A component was dirtied: {comp.GetType()}");
 
-                        if (compState != null)
+                        if ((meta.Flags & MetaDataFlags.Detached) == 0 && compState != null)
                         {
                             var handleState = new ComponentHandleState(compState, null);
                             _entities.EventBus.RaiseComponentEvent(entity, comp, ref handleState);

Robust.Client/Graphics/Clyde/Clyde.GridRendering.cs

@@ -254,9 +254,9 @@ namespace Robust.Client.Graphics.Clyde
                             region = regionMaybe[tile.Variant];
                         }
 
-                        var rotationMirroring = _tileDefinitionManager[tile.TypeId].AllowRotationMirror
-                            ? tile.RotationMirroring
-                            : 0;
+                        var rotationMirroring = (_tileDefinitionManager.TryGetDefinition(tile.TypeId, out var tileDef) && tileDef.AllowRotationMirror) ?
+                                                    tile.RotationMirroring
+                                                    : 0;
 
                         WriteTileToBuffers(i, gridX, gridY, vertexBuffer, indexBuffer, region, rotationMirroring);
                         i += 1;

Robust.Client/Graphics/Clyde/Clyde.Windowing.cs

@@ -467,7 +467,7 @@ namespace Robust.Client.Graphics.Clyde
             _windowing!.RunOnWindowThread(a);
         }
 
-        public IFileDialogManager? FileDialogImpl => _windowing as IFileDialogManager;
+        public IFileDialogManagerImplementation? FileDialogImpl => _windowing as IFileDialogManagerImplementation;
 
         private abstract class WindowReg
         {

Robust.Client/Graphics/Clyde/ClydeHeadless.cs

@@ -307,7 +307,7 @@ namespace Robust.Client.Graphics.Clyde
             action();
         }
 
-        public IFileDialogManager? FileDialogImpl => null;
+        public IFileDialogManagerImplementation? FileDialogImpl => null;
 
         private sealed class DummyCursor : ICursor
         {

Robust.Client/Graphics/Clyde/Windowing/Glfw.Windows.cs

@@ -662,6 +662,10 @@ namespace Robust.Client.Graphics.Clyde
             {
                 var icons = _clyde.LoadWindowIcons().ToArray();
 
+                // Done if no icon (e.g., macOS)
+                if (icons.Length == 0)
+                    return;
+
                 // Turn each image into a byte[] so we can actually pin their contents.
                 // Wish I knew a clean way to do this without allocations.
                 var images = icons

Robust.Client/Graphics/Clyde/Windowing/Sdl3.FileDialog.cs

@@ -1,5 +1,4 @@
 using System;
-using System.IO;
 using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
@@ -12,31 +11,16 @@ namespace Robust.Client.Graphics.Clyde;
 
 internal partial class Clyde
 {
-    private sealed partial class Sdl3WindowingImpl : IFileDialogManager
+    private sealed partial class Sdl3WindowingImpl : IFileDialogManagerImplementation
     {
-        public async Task<Stream?> OpenFile(FileDialogFilters? filters = null)
+        public async Task<string?> OpenFile(FileDialogFilters? filters)
         {
-            var fileName = await ShowFileDialogOfType(SDL.SDL_FILEDIALOG_OPENFILE, filters);
-            if (fileName == null)
-                return null;
-
-            return File.OpenRead(fileName);
+            return await ShowFileDialogOfType(SDL.SDL_FILEDIALOG_OPENFILE, filters);
         }
 
-        public async Task<(Stream fileStream, bool alreadyExisted)?> SaveFile(FileDialogFilters? filters = null, bool truncate = true)
+        public async Task<string?> SaveFile(FileDialogFilters? filters)
         {
-            var fileName = await ShowFileDialogOfType(SDL.SDL_FILEDIALOG_SAVEFILE, filters);
-            if (fileName == null)
-                return null;
-
-            try
-            {
-                return (File.Open(fileName, truncate ? FileMode.Truncate : FileMode.Open), true);
-            }
-            catch (FileNotFoundException)
-            {
-                return (File.Open(fileName, FileMode.Create), false);
-            }
+            return await ShowFileDialogOfType(SDL.SDL_FILEDIALOG_SAVEFILE, filters);
         }
 
         private unsafe Task<string?> ShowFileDialogOfType(int type, FileDialogFilters? filters)
@@ -74,6 +58,8 @@ internal partial class Clyde
                     NativeMemory.Free(filter.name);
                     NativeMemory.Free(filter.pattern);
                 }
+
+                NativeMemory.Free(filtersAlloc);
             }
 
             return task;

Robust.Client/Graphics/IClydeInternal.cs

@@ -71,6 +71,6 @@ namespace Robust.Client.Graphics
 
         void RunOnWindowThread(Action action);
 
-        IFileDialogManager? FileDialogImpl { get; }
+        IFileDialogManagerImplementation? FileDialogImpl { get; }
     }
 }

Robust.Client/Physics/DebugPhysicsIslandSystem.cs

@@ -47,7 +47,7 @@ namespace Robust.Client.Physics
          * This will draw above every body involved in a particular island solve.
          */
 
-        public readonly Queue<(TimeSpan Time, List<PhysicsComponent> Bodies)> IslandSolve = new();
+        public readonly Queue<(TimeSpan Time, List<Entity<PhysicsComponent, TransformComponent>> Bodies)> IslandSolve = new();
         public const float SolveDuration = 0.1f;
 
         public override void Initialize()

Robust.Client/Physics/JointSystem.cs

@@ -67,7 +67,7 @@ namespace Robust.Client.Physics
 
                 // Add new joint (if possible).
                 // Need to wait for BOTH joint components to come in first before we can add it. Yay dependencies!
-                if (!EntityManager.HasComponent<JointComponent>(other))
+                if (!HasComp<JointComponent>(other))
                     continue;
 
                 // TODO: if (other entity is outside of PVS range) continue;

Robust.Client/Physics/PhysicsSystem.Predict.cs

@@ -90,9 +90,10 @@ public sealed partial class PhysicsSystem
         // existing contacts for predicted entities before performing any actual prediction.
 
         var contacts = new List<Contact>();
-        var maps = new HashSet<EntityUid>();
 
         var enumerator = AllEntityQuery<PredictedPhysicsComponent, PhysicsComponent, TransformComponent>();
+        _broadphase.FindNewContacts();
+
         while (enumerator.MoveNext(out _, out var physics, out var xform))
         {
             DebugTools.Assert(physics.Predict);
@@ -100,10 +101,6 @@ public sealed partial class PhysicsSystem
             if (xform.MapUid is not { } map)
                 continue;
 
-            if (maps.Add(map) && PhysMapQuery.TryGetComponent(map, out var physMap) &&
-                MapQuery.TryGetComponent(map, out var mapComp))
-                _broadphase.FindNewContacts(physMap, mapComp.MapId);
-
             contacts.AddRange(physics.Contacts);
         }
 

Robust.Client/Physics/PhysicsSystem.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using JetBrains.Annotations;
+using Robust.Shared.Collections;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Physics;
@@ -23,21 +24,23 @@ namespace Robust.Client.Physics
             SimulateWorld(frameTime, _gameTiming.InPrediction);
         }
 
-        protected override void Cleanup(PhysicsMapComponent component, float frameTime)
+        protected override void Cleanup(float frameTime)
         {
-            var toRemove = new List<Entity<PhysicsComponent>>();
+            var toRemove = new ValueList<Entity<PhysicsComponent, TransformComponent>>();
 
             // Because we're not predicting 99% of bodies its sleep timer never gets incremented so we'll just do it ourselves.
             // (and serializing it over the network isn't necessary?)
             // This is a client-only problem.
             // Also need to suss out having the client build the island anyway and just... not solving it?
-            foreach (var body in component.AwakeBodies)
+            foreach (var ent in AwakeBodies)
             {
+                var body = ent.Comp1;
+
                 if (!body.SleepingAllowed || body.LinearVelocity.Length() > LinearToleranceSqr / 2f || body.AngularVelocity * body.AngularVelocity > AngularToleranceSqr / 2f) continue;
                 body.SleepTime += frameTime;
                 if (body.SleepTime > TimeToSleep)
                 {
-                    toRemove.Add(new Entity<PhysicsComponent>(body.Owner, body));
+                    toRemove.Add(ent);
                 }
             }
 
@@ -46,37 +49,38 @@ namespace Robust.Client.Physics
                 SetAwake(body, false);
             }
 
-            base.Cleanup(component, frameTime);
+            base.Cleanup(frameTime);
         }
 
-        protected override void UpdateLerpData(PhysicsMapComponent component, List<PhysicsComponent> bodies, EntityQuery<TransformComponent> xformQuery)
+        protected override void UpdateLerpData(List<Entity<PhysicsComponent, TransformComponent>> bodies)
         {
-            foreach (var body in bodies)
+            foreach (var bodyEnt in bodies)
             {
+                var body = bodyEnt.Comp1;
+                var xform = bodyEnt.Comp2;
+
                 if (body.BodyType == BodyType.Static ||
-                    component.LerpData.TryGetValue(body.Owner, out var lerpData) ||
-                    !xformQuery.TryGetComponent(body.Owner, out var xform) ||
-                    lerpData.ParentUid == xform.ParentUid)
+                    LerpData.TryGetValue(bodyEnt, out var lerpData) ||
+                    lerpData == xform.ParentUid)
                 {
                     continue;
                 }
 
-                component.LerpData[xform.Owner] = (xform.ParentUid, xform.LocalPosition, xform.LocalRotation);
+                LerpData[bodyEnt.Owner] = xform.ParentUid;
             }
         }
 
         /// <summary>
         /// Flush all of our lerping data.
         /// </summary>
-        protected override void FinalStep(PhysicsMapComponent component)
+        protected override void FinalStep()
         {
-            base.FinalStep(component);
-            var xformQuery = GetEntityQuery<TransformComponent>();
+            base.FinalStep();
 
-            foreach (var (uid, (parentUid, position, rotation)) in component.LerpData)
+            foreach (var (uid, parentUid) in LerpData)
             {
-                if (!xformQuery.TryGetComponent(uid, out var xform) ||
-                    !parentUid.IsValid())
+                // Can't just re-use xform from before as movement events may cause event subs to fire.
+                if (!XformQuery.TryGetComponent(uid, out var xform) || !parentUid.IsValid())
                 {
                     continue;
                 }
@@ -85,7 +89,7 @@ namespace Robust.Client.Physics
                 _transform.SetLocalPositionRotation(uid, xform.LocalPosition, xform.LocalRotation, xform);
             }
 
-            component.LerpData.Clear();
+            LerpData.Clear();
         }
     }
 }

Robust.Client/Upload/Commands/LoadPrototypeCommand.cs

@@ -22,7 +22,7 @@ public sealed class LoadPrototypeCommand : IConsoleCommand
         var dialogManager = IoCManager.Resolve<IFileDialogManager>();
         var loadManager = IoCManager.Resolve<IGamePrototypeLoadManager>();
 
-        var stream = await dialogManager.OpenFile();
+        var stream = await dialogManager.OpenFile(access: FileAccess.Read);
         if (stream is null)
             return;
 

Robust.Client/Upload/Commands/UploadFileCommand.cs

@@ -1,3 +1,4 @@
+using System.IO;
 using Robust.Client.UserInterface;
 using Robust.Shared;
 using Robust.Shared.Configuration;
@@ -36,7 +37,7 @@ public sealed class UploadFileCommand : IConsoleCommand
         var path = new ResPath(args[0]).ToRelativePath();
 
         var filters = new FileDialogFilters(new FileDialogFilters.Group(path.Extension));
-        await using var file = await _dialog.OpenFile(filters);
+        await using var file = await _dialog.OpenFile(filters, FileAccess.Read);
 
         if (file == null)
         {

Robust.Client/UserInterface/Control.cs

@@ -994,6 +994,9 @@ namespace Robust.Client.UserInterface
 
         internal int DoFrameUpdateRecursive(FrameEventArgs args)
         {
+            if (!Visible)
+                return 0;
+
             var total = 1;
             FrameUpdate(args);
 

Robust.Client/UserInterface/Controllers/UIController.cs

@@ -1,6 +1,9 @@
 using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
+using System.Linq;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
+using Robust.Shared.Log;
 using Robust.Shared.Timing;
 
 namespace Robust.Client.UserInterface.Controllers;
@@ -11,11 +14,14 @@ namespace Robust.Client.UserInterface.Controllers;
 ///     and <see cref="UISystemDependencyAttribute"/> to depend on <see cref="EntitySystem"/>s, which will be automatically
 ///     injected once they are created.
 /// </summary>
-public abstract partial class UIController
+public abstract partial class UIController : IPostInjectInit
 {
     [Dependency] protected readonly IUserInterfaceManager UIManager = default!;
     [Dependency] protected readonly IEntitySystemManager EntitySystemManager = default!;
     [Dependency] protected readonly IEntityManager EntityManager = default!;
+    [Dependency] protected readonly ILogManager LogManager = default!;
+
+    public ISawmill Log { get; protected set; } = default!;
 
     public virtual void Initialize()
     {
@@ -24,4 +30,39 @@ public abstract partial class UIController
     public virtual void FrameUpdate(FrameEventArgs args)
     {
     }
+
+    protected virtual string SawmillName
+    {
+        get
+        {
+            var name = GetType().Name;
+
+            // Strip trailing "UIController"
+            if (name.EndsWith("UIController"))
+                name = name.Substring(0, name.Length - "UIController".Length);
+
+            // Convert CamelCase to snake_case
+            // Ignore if all uppercase, assume acronym (e.g. NPC or HTN)
+            if (name.All(char.IsUpper))
+            {
+                name = name.ToLower(CultureInfo.InvariantCulture);
+            }
+            else
+            {
+                name = string.Concat(name.Select(x => char.IsUpper(x) ? $"_{char.ToLower(x)}" : x.ToString()));
+                name = name.Trim('_');
+            }
+
+            return $"ui.{name}";
+        }
+    }
+
+    public void PostInject()
+    {
+        Log = LogManager.GetSawmill(SawmillName);
+
+#if !DEBUG
+        Log.Level = LogLevel.Info;
+#endif
+    }
 }

Robust.Client/UserInterface/Controls/ColorSelectorSliders.cs

@@ -42,6 +42,7 @@ public sealed class ColorSelectorSliders : Control
                     break;
             }
             _currentType = value;
+            _typeSelector.Select(_types.IndexOf(value));
             UpdateType();
             Update();
         }

Robust.Client/UserInterface/Controls/OutputPanel.cs

@@ -107,6 +107,11 @@ namespace Robust.Client.UserInterface.Controls
             _scrollBar.Value = 0;
         }
 
+        public FormattedMessage GetMessage(Index index)
+        {
+            return new FormattedMessage(_entries[index].Message);
+        }
+
         public void RemoveEntry(Index index)
         {
             var entry = _entries[index];
@@ -138,6 +143,31 @@ namespace Robust.Client.UserInterface.Controls
 
             _entries.Add(entry);
             var font = _getFont();
+            AddNewItemHeight(font, entry);
+
+            _scrollBar.MaxValue = Math.Max(_scrollBar.Page, _totalContentHeight);
+            if (_isAtBottom && ScrollFollowing)
+            {
+                _scrollBar.MoveToEnd();
+            }
+        }
+
+        public void SetMessage(Index index, FormattedMessage message, Type[]? tagsAllowed = null, Color? defaultColor = null)
+        {
+            var oldEntry = _entries[index];
+            var font = _getFont();
+            _totalContentHeight -= oldEntry.Height + font.GetLineSeparation(UIScale);
+            _scrollBar.MaxValue = Math.Max(_scrollBar.Page, _totalContentHeight);
+
+            var entry = new RichTextEntry(message, this, _tagManager, tagsAllowed, defaultColor);
+            entry.Update(_tagManager, _getFont(), _getContentBox().Width, UIScale);
+            _entries[index] = entry;
+
+            AddNewItemHeight(font, in entry);
+        }
+
+        private void AddNewItemHeight(Font font, in RichTextEntry entry)
+        {
             _totalContentHeight += entry.Height;
             if (_firstLine)
             {
@@ -147,12 +177,6 @@ namespace Robust.Client.UserInterface.Controls
             {
                 _totalContentHeight += font.GetLineSeparation(UIScale);
             }
-
-            _scrollBar.MaxValue = Math.Max(_scrollBar.Page, _totalContentHeight);
-            if (_isAtBottom && ScrollFollowing)
-            {
-                _scrollBar.MoveToEnd();
-            }
         }
 
         public void ScrollToBottom()

Robust.Client/UserInterface/Controls/TabContainer.cs

@@ -30,12 +30,12 @@ namespace Robust.Client.UserInterface.Controls
             get => _currentTab;
             set
             {
-                if (_currentTab < 0)
+                if (value < 0)
                 {
                     throw new ArgumentOutOfRangeException(nameof(value), value, "Current tab must be positive.");
                 }
 
-                if (_currentTab >= ChildCount)
+                if (value >= ChildCount)
                 {
                     throw new ArgumentOutOfRangeException(nameof(value), value,
                         "Current tab must less than the amount of tabs.");

Robust.Client/UserInterface/CustomControls/DefaultWindow.xaml.cs

@@ -145,6 +145,11 @@ namespace Robust.Client.UserInterface.CustomControls
 
         protected override void FrameUpdate(FrameEventArgs args)
         {
+            // This is to avoid unnecessarily setting a position where our size isn't yet fully updated.
+            // This most commonly happens with saved window positions if your window position is <= 0.
+            if (!IsMeasureValid)
+                return;
+
             var (spaceX, spaceY) = Parent!.Size;
 
             var maxX = spaceX - ((AllowOffScreen & DirectionFlag.West) == 0 ? Size.X : WindowEdgeSeparation);

Robust.Client/UserInterface/DummyFileDialogManager.cs

@@ -8,12 +8,19 @@ namespace Robust.Client.UserInterface
     /// </summary>
     internal sealed class DummyFileDialogManager : IFileDialogManager
     {
-        public Task<Stream?> OpenFile(FileDialogFilters? filters = null)
+        public Task<Stream?> OpenFile(
+            FileDialogFilters? filters = null,
+            FileAccess access = FileAccess.ReadWrite,
+            FileShare? share = null)
         {
             return Task.FromResult<Stream?>(null);
         }
 
-        public Task<(Stream fileStream, bool alreadyExisted)?> SaveFile(FileDialogFilters? filters = null, bool truncate = true)
+        public Task<(Stream fileStream, bool alreadyExisted)?> SaveFile(
+            FileDialogFilters? filters = null,
+            bool truncate = true,
+            FileAccess access = FileAccess.ReadWrite,
+            FileShare share = FileShare.None)
         {
             return Task.FromResult<(Stream fileStream, bool alreadyExisted)?>(null);
         }

Robust.Client/UserInterface/FileDialogManager.cs

@@ -7,9 +7,7 @@ using System.Runtime.InteropServices;
 using System.Text;
 using System.Threading.Tasks;
 using Robust.Client.Graphics;
-using Robust.Shared;
 using Robust.Shared.Console;
-using Robust.Shared.Asynchronous;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Utility;
@@ -20,28 +18,41 @@ namespace Robust.Client.UserInterface
     [SuppressMessage("ReSharper", "IdentifierTypo")]
     [SuppressMessage("ReSharper", "CommentTypo")]
     [SuppressMessage("ReSharper", "StringLiteralTypo")]
-    internal sealed class FileDialogManager : IFileDialogManager
+    internal sealed class FileDialogManager : IFileDialogManager, IPostInjectInit
     {
         // Uses nativefiledialog to open the file dialogs cross platform.
         // On Linux, if the kdialog command is found, it will be used instead.
         // TODO: Should we maybe try to avoid running kdialog if the DE isn't KDE?
         [Dependency] private readonly IClydeInternal _clyde = default!;
+        [Dependency] private readonly ILogManager _log = default!;
+
+        private ISawmill _sawmill = default!;
 
         private bool _kDialogAvailable;
         private bool _checkedKDialogAvailable;
 
-        public async Task<Stream?> OpenFile(FileDialogFilters? filters = null)
+        public async Task<Stream?> OpenFile(
+            FileDialogFilters? filters = null,
+            FileAccess access = FileAccess.ReadWrite,
+            FileShare? share = null)
         {
+            if ((access & FileAccess.ReadWrite) != access)
+                throw new ArgumentException("Invalid file access specified");
+
+            var realShare = share ?? (access == FileAccess.Read ? FileShare.Read : FileShare.None);
+            if ((realShare & (FileShare.ReadWrite | FileShare.Delete)) != realShare)
+                throw new ArgumentException("Invalid file share specified");
+
+            string? name;
             if (_clyde.FileDialogImpl is { } clydeImpl)
-                return await clydeImpl.OpenFile(filters);
+                name = await clydeImpl.OpenFile(filters);
+            else
+                name = await GetOpenFileName(filters);
 
-            var name = await GetOpenFileName(filters);
             if (name == null)
-            {
                 return null;
-            }
 
-            return File.Open(name, FileMode.Open);
+            return File.Open(name, FileMode.Open, access, realShare);
         }
 
         private async Task<string?> GetOpenFileName(FileDialogFilters? filters)
@@ -54,24 +65,34 @@ namespace Robust.Client.UserInterface
             return await OpenFileNfd(filters);
         }
 
-        public async Task<(Stream, bool)?> SaveFile(FileDialogFilters? filters, bool truncate = true)
+        public async Task<(Stream, bool)?> SaveFile(
+            FileDialogFilters? filters,
+            bool truncate = true,
+            FileAccess access = FileAccess.ReadWrite,
+            FileShare share = FileShare.None)
         {
-            if (_clyde.FileDialogImpl is { } clydeImpl)
-                return await clydeImpl.SaveFile(filters);
+            if ((access & FileAccess.ReadWrite) != access)
+                throw new ArgumentException("Invalid file access specified");
+
+            if ((share & (FileShare.ReadWrite | FileShare.Delete)) != share)
+                throw new ArgumentException("Invalid file share specified");
+
+            string? name;
+            if (_clyde.FileDialogImpl is { } clydeImpl)
+                name = await clydeImpl.SaveFile(filters);
+            else
+                name = await GetSaveFileName(filters);
 
-            var name = await GetSaveFileName(filters);
             if (name == null)
-            {
                 return null;
-            }
 
             try
             {
-                return (File.Open(name, truncate ? FileMode.Truncate : FileMode.Open), true);
+                return (File.Open(name, truncate ? FileMode.Truncate : FileMode.Open, access, share), true);
             }
             catch (FileNotFoundException)
             {
-                return (File.Open(name, FileMode.Create), false);
+                return (File.Open(name, FileMode.Create, access, share), false);
             }
         }
 
@@ -249,7 +270,7 @@ namespace Robust.Client.UserInterface
 
                 if (_kDialogAvailable)
                 {
-                    Logger.DebugS("filedialog", "kdialog available.");
+                    _sawmill.Debug("kdialog available.");
                 }
             }
             catch
@@ -386,6 +407,11 @@ namespace Robust.Client.UserInterface
         [DllImport("swnfd.dll")]
         private static extern unsafe void sw_NFD_Free(void* ptr);
 
+        public void PostInject()
+        {
+            _sawmill = _log.GetSawmill("filedialog");
+        }
+
         private enum sw_nfdresult
         {
             SW_NFD_ERROR,

Robust.Client/UserInterface/IFileDialogManager.cs

@@ -1,5 +1,6 @@
 using System.IO;
 using System.Threading.Tasks;
+using Robust.Client.Graphics;
 
 namespace Robust.Client.UserInterface
 {
@@ -19,7 +20,17 @@ namespace Robust.Client.UserInterface
         /// The file stream for the file the user opened.
         /// <see langword="null" /> if the user cancelled the action.
         /// </returns>
-        Task<Stream?> OpenFile(FileDialogFilters? filters = null);
+        /// <param name="filters">Filters for file types that the user can select.</param>
+        /// <param name="access">What access is desired from the file operation.</param>
+        /// <param name="share">
+        /// What sharing mode is desired from the file operation.
+        /// If null is provided and <paramref name="access"/> is <see cref="FileAccess.Read"/>,
+        /// <see cref="FileShare.Read"/> is selected, otherwise <see cref="FileShare.None"/>.
+        /// </param>
+        Task<Stream?> OpenFile(
+            FileDialogFilters? filters = null,
+            FileAccess access = FileAccess.ReadWrite,
+            FileShare? share = null);
 
         /// <summary>
         ///     Open a file dialog used for saving a single file.
@@ -29,6 +40,21 @@ namespace Robust.Client.UserInterface
         /// Null if the user cancelled the action.
         /// </returns>
         /// <param name="truncate">Should we truncate an existing file to 0-size then write or append.</param>
-        Task<(Stream fileStream, bool alreadyExisted)?> SaveFile(FileDialogFilters? filters = null, bool truncate = true);
+        /// <param name="access">What access is desired from the file operation.</param>
+        /// <param name="share">Sharing mode for the opened file.</param>
+        Task<(Stream fileStream, bool alreadyExisted)?> SaveFile(
+            FileDialogFilters? filters = null,
+            bool truncate = true,
+            FileAccess access = FileAccess.ReadWrite,
+            FileShare share = FileShare.None);
+    }
+
+    /// <summary>
+    /// Internal implementation interface used to connect <see cref="FileDialogManager"/> and <see cref="IClydeInternal"/>.
+    /// </summary>
+    internal interface IFileDialogManagerImplementation
+    {
+        Task<string?> OpenFile(FileDialogFilters? filters);
+        Task<string?> SaveFile(FileDialogFilters? filters);
     }
 }

Robust.Client/UserInterface/RichTextEntry.cs

@@ -141,7 +141,7 @@ namespace Robust.Client.UserInterface
                 if (Controls == null || !Controls.TryGetValue(nodeIndex, out var control))
                     continue;
 
-                control.Measure(new Vector2(Width, Height));
+                control.Measure(new Vector2(maxSizeX, Height));
 
                 var desiredSize = control.DesiredPixelSize;
                 var controlMetrics = new CharMetrics(

Robust.Server/Audio/AudioSystem.cs

@@ -137,7 +137,7 @@ public sealed partial class AudioSystem : SharedAudioSystem
 
         if (TerminatingOrDeleted(coordinates.EntityId))
         {
-            Log.Error($"Tried to play coordinates audio on a terminating / deleted entity {ToPrettyString(coordinates.EntityId)}.  Trace: {Environment.StackTrace}");
+            LogAudioPlaybackOnInvalidEntity(specifier, coordinates.EntityId);
             return null;
         }
 
@@ -160,7 +160,7 @@ public sealed partial class AudioSystem : SharedAudioSystem
 
         if (TerminatingOrDeleted(coordinates.EntityId))
         {
-            Log.Error($"Tried to play coordinates audio on a terminating / deleted entity {ToPrettyString(coordinates.EntityId)}.  Trace: {Environment.StackTrace}");
+            LogAudioPlaybackOnInvalidEntity(specifier, coordinates.EntityId);
             return null;
         }
 
@@ -281,4 +281,10 @@ public sealed partial class AudioSystem : SharedAudioSystem
     {
         // TODO: Yeah remove this...
     }
+
+    private void LogAudioPlaybackOnInvalidEntity(ResolvedSoundSpecifier? specifier, EntityUid entityId)
+    {
+        var soundInfo = specifier?.ToString() ?? "unknown sound";
+        Log.Error($"Tried to play coordinates audio on a terminating / deleted entity {ToPrettyString(entityId)}. Sound: {soundInfo}. Trace: {Environment.StackTrace}");
+    }
 }

Robust.Server/BaseServer.cs

@@ -297,7 +297,7 @@ namespace Robust.Server
                 : null;
 
             // Set up the VFS
-            _resources.Initialize(dataDir);
+            _resources.Initialize(dataDir, hideUserDataDir: false);
 
             var mountOptions = _commandLineArgs != null
                 ? MountOptions.Merge(_commandLineArgs.MountOptions, Options.MountOptions) : Options.MountOptions;

Robust.Server/GameObjects/EntitySystems/MapSystem.cs

@@ -60,7 +60,7 @@ namespace Robust.Server.GameObjects
 
                 foreach (var uid in toDelete)
                 {
-                    EntityManager.DeleteEntity(uid);
+                    Del(uid);
                 }
             }
         }
@@ -75,7 +75,7 @@ namespace Robust.Server.GameObjects
             if (!_deleteEmptyGrids || TerminatingOrDeleted(uid) || HasComp<MapComponent>(uid))
                 return;
 
-            EntityManager.DeleteEntity(args.GridId);
+            Del(args.GridId);
         }
     }
 }

Robust.Server/GameObjects/EntitySystems/ViewSubscriberSystem.cs

@@ -20,7 +20,7 @@ public sealed class ViewSubscriberSystem : SharedViewSubscriberSystem
     public override void AddViewSubscriber(EntityUid uid, ICommonSession session)
     {
         // If the entity doesn't have the component, it will be added.
-        var viewSubscriber = EntityManager.EnsureComponent<Shared.GameObjects.ViewSubscriberComponent>(uid);
+        var viewSubscriber = EnsureComp<Shared.GameObjects.ViewSubscriberComponent>(uid);
 
         if (viewSubscriber.SubscribedSessions.Contains(session))
             return; // Already subscribed, do nothing else.
@@ -36,7 +36,7 @@ public sealed class ViewSubscriberSystem : SharedViewSubscriberSystem
     /// </summary>
     public override void RemoveViewSubscriber(EntityUid uid, ICommonSession session)
     {
-        if(!EntityManager.TryGetComponent(uid, out Shared.GameObjects.ViewSubscriberComponent? viewSubscriber))
+        if(!TryComp(uid, out Shared.GameObjects.ViewSubscriberComponent? viewSubscriber))
             return; // Entity didn't have any subscriptions, do nothing.
 
         if (!viewSubscriber.SubscribedSessions.Remove(session))

Robust.Server/GameStates/PvsSystem.GetStates.cs

@@ -132,7 +132,7 @@ internal sealed partial class PvsSystem
 
         if (enumerateAll)
         {
-            var query = EntityManager.AllEntityQueryEnumerator<MetaDataComponent>();
+            var query = AllEntityQuery<MetaDataComponent>();
             while (query.MoveNext(out var uid, out var md))
             {
                 DebugTools.Assert(md.EntityLifeStage >= EntityLifeStage.Initialized, $"Entity {ToPrettyString(uid)} has not been initialized");

Robust.Server/GameStates/PvsSystem.cs

@@ -199,7 +199,7 @@ internal sealed partial class PvsSystem : EntitySystem
 
         foreach (var uid in _toDelete)
         {
-            EntityManager.QueueDeleteEntity(uid);
+            QueueDel(uid);
         }
         _toDelete.Clear();
 

Robust.Server/Physics/Commands/BoxStackCommand.cs

@@ -0,0 +1,82 @@
+using System.Collections.Generic;
+using System.Numerics;
+using Robust.Shared.Console;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Map;
+using Robust.Shared.Physics;
+using Robust.Shared.Physics.Collision.Shapes;
+using Robust.Shared.Physics.Components;
+using Robust.Shared.Physics.Controllers;
+using Robust.Shared.Physics.Dynamics;
+using Robust.Shared.Physics.Systems;
+
+namespace Robust.Server.Physics.Commands;
+
+public sealed class BoxStackCommand : IConsoleCommand
+{
+    [Dependency] private readonly IEntityManager _entManager = default!;
+
+    public string Command => "boxstack";
+    public string Description => string.Empty;
+    public string Help => "boxstack [mapid] [columns] [rows]";
+    public void Execute(IConsoleShell shell, string argStr, string[] args)
+    {
+        if (args.Length != 3 ||
+            !int.TryParse(args[0], out var mapInt) ||
+            !int.TryParse(args[1], out var columns) ||
+            !int.TryParse(args[2], out var rows))
+        {
+            return;
+        }
+
+        var mapId = new MapId(mapInt);
+
+        var fixtureSystem = _entManager.System<FixtureSystem>();
+        var physSystem = _entManager.System<SharedPhysicsSystem>();
+        physSystem.SetGravity(new Vector2(0f, -9.8f));
+
+        var groundUid = _entManager.SpawnEntity(null, new MapCoordinates(0, 0, mapId));
+        var ground = _entManager.AddComponent<PhysicsComponent>(groundUid);
+        var groundManager = _entManager.EnsureComponent<FixturesComponent>(groundUid);
+
+        var horizontal = new EdgeShape(new Vector2(-40, 0), new Vector2(40, 0));
+        fixtureSystem.CreateFixture(groundUid, "fix1", new Fixture(horizontal, 1, 1, true), manager: groundManager, body: ground);
+
+        var vertical = new EdgeShape(new Vector2(10, 0), new Vector2(10, 10));
+        fixtureSystem.CreateFixture(groundUid, "fix2", new Fixture(vertical, 1, 1, true), manager: groundManager, body: ground);
+
+        physSystem.WakeBody(groundUid, manager: groundManager, body: ground);
+
+        var xs = new[]
+        {
+            0.0f, -10.0f, -5.0f, 5.0f, 10.0f
+        };
+
+        for (var j = 0; j < columns; j++)
+        {
+            for (var i = 0; i < rows; i++)
+            {
+                var x = 0.0f;
+
+                var boxUid = _entManager.SpawnEntity(null,
+                    new MapCoordinates(new Vector2(xs[j] + x, 0.55f + 2.1f * i), mapId));
+                var box = _entManager.AddComponent<PhysicsComponent>(boxUid);
+                var manager = _entManager.EnsureComponent<FixturesComponent>(boxUid);
+
+                physSystem.SetBodyType(boxUid, BodyType.Dynamic, manager: manager, body: box);
+                var poly = new PolygonShape(0.001f);
+                poly.Set(new List<Vector2>()
+                {
+                    new(0.5f, -0.5f),
+                    new(0.5f, 0.5f),
+                    new(-0.5f, 0.5f),
+                    new(-0.5f, -0.5f),
+                });
+
+                fixtureSystem.CreateFixture(boxUid, "fix1", new Fixture(poly, 1, 1, true), manager: manager, body: box);
+                physSystem.WakeBody(boxUid, manager: manager, body: box);
+            }
+        }
+    }
+}

Robust.Server/Placement/PlacementManager.cs

@@ -140,7 +140,7 @@ namespace Robust.Server.Placement
             {
                 // Replace existing entities if relevant.
                 if (msg.Replacement && _prototype.Index<EntityPrototype>(entityTemplateName).Components.TryGetValue(
-                        _factory.GetComponentName(typeof(PlacementReplacementComponent)), out var compRegistry))
+                        _factory.GetComponentName<PlacementReplacementComponent>(), out var compRegistry))
                 {
                     var key = ((PlacementReplacementComponent)compRegistry.Component).Key;
                     var gridUid = _xformSystem.GetGrid(coordinates);

Robust.Server/Player/FilterSystem.cs

@@ -10,7 +10,7 @@ namespace Robust.Server.Player
         {
             foreach (var uid in entities)
             {
-                if (EntityManager.TryGetComponent(uid, out ActorComponent? actor))
+                if (TryComp(uid, out ActorComponent? actor))
                     filter.AddPlayer(actor.PlayerSession);
             }
 

Robust.Server/Scripting/ScriptHost.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Diagnostics.CodeAnalysis;
@@ -188,13 +189,20 @@ namespace Robust.Server.Scripting
             }
 
             // Compile ahead of time so that we can do syntax highlighting correctly for the echo.
-            newScript.Compile();
+            await Task.Run(() =>
+            {
+                newScript.Compile();
 
-            // Echo entered script.
-            var echoMessage = new FormattedMessage();
-            ScriptInstanceShared.AddWithSyntaxHighlighting(newScript, echoMessage, code, instance.HighlightWorkspace);
+                // Echo entered script.
+                var echoMessage = new FormattedMessage();
+                ScriptInstanceShared.AddWithSyntaxHighlighting(
+                    newScript,
+                    echoMessage,
+                    code,
+                    instance.HighlightWorkspace.Value);
 
-            replyMessage.Echo = echoMessage;
+                replyMessage.Echo = echoMessage;
+            });
 
             var msg = new FormattedMessage();
 
@@ -332,7 +340,7 @@ namespace Robust.Server.Scripting
 
         private sealed class ScriptInstance
         {
-            public Workspace HighlightWorkspace { get; } = new AdhocWorkspace();
+            public Lazy<Workspace> HighlightWorkspace { get; } = new(() => new AdhocWorkspace());
             public StringBuilder InputBuffer { get; } = new();
             public FormattedMessage OutputBuffer { get; } = new();
             public bool RunningScript { get; set; }
@@ -373,7 +381,7 @@ namespace Robust.Server.Scripting
                     script.Compile();
 
                     var syntax = new FormattedMessage();
-                    ScriptInstanceShared.AddWithSyntaxHighlighting(script, syntax, code, _scriptInstance.HighlightWorkspace);
+                    ScriptInstanceShared.AddWithSyntaxHighlighting(script, syntax, code, _scriptInstance.HighlightWorkspace.Value);
 
                     _scriptInstance.OutputBuffer.AddMessage(syntax);
                 }

Robust.Shared.Maths/Box2i.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics.Contracts;
 using System.Numerics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
@@ -101,6 +102,7 @@ namespace Robust.Shared.Maths
         /// <summary>
         ///     Returns the smallest rectangle that contains both of the rectangles.
         /// </summary>
+        [Pure]
         public readonly Box2i Union(in Box2i other)
         {
             var botLeft = Vector2i.ComponentMin(BottomLeft, other.BottomLeft);
@@ -207,6 +209,7 @@ namespace Robust.Shared.Maths
         /// <summary>
         /// Multiplies each side of the box by the scalar.
         /// </summary>
+        [Pure]
         public Box2i Scale(int scalar)
         {
             return new Box2i(
@@ -215,6 +218,21 @@ namespace Robust.Shared.Maths
                 Right * scalar,
                 Top * scalar);
         }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        [Pure]
+        public bool Intersects(in Box2i other)
+        {
+            return other.Bottom <= this.Top && other.Top >= this.Bottom && other.Right >= this.Left &&
+                   other.Left <= this.Right;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        [Pure]
+        public readonly Box2i Enlarged(int size)
+        {
+            return new(Left - size, Bottom - size, Right + size, Top + size);
+        }
     }
 
     /// <summary>

Robust.Shared/Audio/ResolvedSoundSpecifier.cs

@@ -13,7 +13,8 @@ namespace Robust.Shared.Audio;
 /// <seealso cref="ResolvedPathSpecifier"/>
 /// <seealso cref="ResolvedCollectionSpecifier"/>
 [Serializable, NetSerializable]
-public abstract partial class ResolvedSoundSpecifier {
+public abstract partial class ResolvedSoundSpecifier
+{
     [Obsolete("String literals for sounds are deprecated, use a SoundSpecifier or ResolvedSoundSpecifier as appropriate instead")]
     public static implicit operator ResolvedSoundSpecifier(string s) => new ResolvedPathSpecifier(s);
     [Obsolete("String literals for sounds are deprecated, use a SoundSpecifier or ResolvedSoundSpecifier as appropriate instead")]
@@ -22,8 +23,10 @@ public abstract partial class ResolvedSoundSpecifier {
     /// <summary>
     /// Returns whether <c>s</c> is null, or if it contains an empty path/collection ID.
     /// </summary>
-    public static bool IsNullOrEmpty(ResolvedSoundSpecifier? s) {
-        return s switch {
+    public static bool IsNullOrEmpty(ResolvedSoundSpecifier? s)
+    {
+        return s switch
+        {
             null => true,
             ResolvedPathSpecifier path => path.Path.ToString() == "",
             ResolvedCollectionSpecifier collection => string.IsNullOrEmpty(collection.Collection),
@@ -37,7 +40,8 @@ public abstract partial class ResolvedSoundSpecifier {
 /// </summary>
 /// <seealso cref="ResolvedCollectionSpecifier"/>
 [Serializable, NetSerializable]
-public sealed partial class ResolvedPathSpecifier : ResolvedSoundSpecifier {
+public sealed partial class ResolvedPathSpecifier : ResolvedSoundSpecifier, IEquatable<ResolvedPathSpecifier>
+{
     /// <summary>
     /// The resource path of the sound.
     /// </summary>
@@ -57,6 +61,21 @@ public sealed partial class ResolvedPathSpecifier : ResolvedSoundSpecifier {
     public ResolvedPathSpecifier(string path) : this(new ResPath(path))
     {
     }
+
+    public bool Equals(ResolvedPathSpecifier? other)
+    {
+        return Path.Equals(other?.Path);
+    }
+
+    public override bool Equals(object? obj)
+    {
+        return Equals(obj as ResolvedPathSpecifier);
+    }
+
+    public override int GetHashCode()
+    {
+        return Path.GetHashCode();
+    }
 }
 
 /// <summary>
@@ -64,7 +83,9 @@ public sealed partial class ResolvedPathSpecifier : ResolvedSoundSpecifier {
 /// </summary>
 /// <seealso cref="ResolvedPathSpecifier"/>
 [Serializable, NetSerializable]
-public sealed partial class ResolvedCollectionSpecifier : ResolvedSoundSpecifier {
+public sealed partial class ResolvedCollectionSpecifier : ResolvedSoundSpecifier, IEquatable<ResolvedCollectionSpecifier>
+{
+
     /// <summary>
     /// The ID of the <see cref="SoundCollectionPrototype">sound collection</see> to look up.
     /// </summary>
@@ -87,4 +108,19 @@ public sealed partial class ResolvedCollectionSpecifier : ResolvedSoundSpecifier
         Collection = collection;
         Index = index;
     }
+
+    public bool Equals(ResolvedCollectionSpecifier? other)
+    {
+        return Collection.Equals(other?.Collection) && Index.Equals(other?.Index);
+    }
+
+    public override bool Equals(object? obj)
+    {
+        return Equals(obj as ResolvedCollectionSpecifier);
+    }
+
+    public override int GetHashCode()
+    {
+        return HashCode.Combine(Collection, Index);
+    }
 }

Robust.Shared/Audio/Systems/SharedAudioSystem.cs

@@ -665,7 +665,7 @@ public abstract partial class SharedAudioSystem : EntitySystem
     /// <param name="coordinates">The coordinates at which to play the audio.</param>
     public (EntityUid Entity, Components.AudioComponent Component)? PlayStatic(SoundSpecifier? sound, Filter playerFilter, EntityCoordinates coordinates, bool recordReplay, AudioParams? audioParams = null)
     {
-        return sound == null ? null : PlayStatic(ResolveSound(sound), playerFilter, coordinates, recordReplay, audioParams);
+        return sound == null ? null : PlayStatic(ResolveSound(sound), playerFilter, coordinates, recordReplay, audioParams ?? sound.Params);
     }
 
     /// <summary>

Robust.Shared/Console/Commands/TeleportCommands.cs

@@ -127,19 +127,20 @@ public sealed class TeleportToCommand : LocalizedEntityCommands
         {
             foreach (var victim in args)
             {
-                if (victim == target)
+                if (!TryGetTransformFromUidOrUsername(victim, shell, out var uid, out var victimTransform))
                     continue;
 
-                if (!TryGetTransformFromUidOrUsername(victim, shell, out var uid, out var victimTransform))
+                if (uid == targetUid)
                     continue;
 
                 victims.Add((uid.Value, victimTransform));
             }
         }
 
+        var targetMapCoords = _transform.ToMapCoordinates(targetCoords);
         foreach (var victim in victims)
         {
-            _transform.SetCoordinates(victim.Entity, targetCoords);
+            _transform.SetMapCoordinates(victim.Entity, targetMapCoords);
             _transform.AttachToGridOrMap(victim.Entity, victim.Transform);
         }
     }

Robust.Shared/Console/CompletionHelper.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -155,7 +156,7 @@ public static class CompletionHelper
     ///     Returns a completion list for all prototype IDs of the given type.
     /// </summary>
     /// <remarks>
-    ///     Don't use this for prototypes types that likely have a large number of entries, like <see cref="EntityPrototype"/>.
+    ///     Don't use this for prototypes types that likely have a large number of entries, like <see cref="EntityPrototype"/>, use <see cref="PrototypeIdsLimited{T}"/> instead.
     /// </remarks>
     public static IEnumerable<CompletionOption> PrototypeIDs<T>(bool sorted = true, IPrototypeManager? proto = null)
         where T: class, IPrototype
@@ -166,6 +167,36 @@ public static class CompletionHelper
         return sorted ? protoOptions.OrderBy(o => o.Value) : protoOptions;
     }
 
+    /// <summary>
+    /// Returns a completion list for all prototype IDs of the given type, limited to avoid performance problems.
+    /// </summary>
+    /// <remarks>
+    /// This is a limited alternative to <see cref="PrototypeIDs{T}"/>.
+    /// The limit is applied before sorting of results, so the unfiltered results are somewhat arbitrary.
+    /// </remarks>
+    /// <param name="currentArgument">The argument being currently typed for the completion.</param>
+    /// <param name="proto">The <see cref="IPrototypeManager"/>.</param>
+    /// <param name="sorted">Whether to sort the results or not.</param>
+    /// <param name="maxCount">The maximum amount of results to return at once.</param>
+    /// <typeparam name="T">The type of prototype to search through.</typeparam>
+    /// <returns></returns>
+    public static IEnumerable<CompletionOption> PrototypeIdsLimited<T>(
+        string currentArgument,
+        IPrototypeManager proto,
+        bool sorted = true,
+        int maxCount = 30) where T : class, IPrototype
+    {
+        var protoOptions = proto.EnumeratePrototypes<T>()
+            .Where(p => p.ID.StartsWith(currentArgument, StringComparison.OrdinalIgnoreCase))
+            .Take(maxCount)
+            .Select(p => new CompletionOption(p.ID));
+
+        if (sorted)
+            protoOptions = protoOptions.OrderBy(o => o.Value);
+
+        return protoOptions;
+    }
+
     /// <summary>
     ///     Returns a list of connected session names.
     /// </summary>

Robust.Shared/Containers/SharedContainerSystem.cs

@@ -279,16 +279,6 @@ namespace Robust.Shared.Containers
 
         #region Container Helpers
 
-        [Obsolete("Use Entity<T> variant")]
-        public bool TryGetContainingContainer(
-            EntityUid uid,
-            [NotNullWhen(true)] out BaseContainer? container,
-            MetaDataComponent? meta = null,
-            TransformComponent? transform = null)
-        {
-            return TryGetContainingContainer((uid, transform, meta), out container);
-        }
-
         public bool TryGetContainingContainer(
             Entity<TransformComponent?, MetaDataComponent?> ent,
             [NotNullWhen(true)] out BaseContainer? container)
@@ -401,13 +391,6 @@ namespace Robust.Shared.Containers
             return TryFindComponentsOnEntityContainerOrParent(xform.ParentUid, entityQuery, foundComponents);
         }
 
-
-        [Obsolete("Use Entity<T> variant")]
-        public bool IsInSameOrNoContainer(EntityUid user, EntityUid other)
-        {
-            return IsInSameOrNoContainer((user, null, null), (other, null, null));
-        }
-
         /// <summary>
         ///     Returns true if the two entities are not contained, or are contained in the same container.
         /// </summary>
@@ -428,13 +411,6 @@ namespace Robust.Shared.Containers
             return userContainer == otherContainer;
         }
 
-
-        [Obsolete("Use Entity<T> variant")]
-        public bool IsInSameOrParentContainer(EntityUid user, EntityUid other)
-        {
-            return IsInSameOrParentContainer((user, null), other);
-        }
-
         /// <summary>
         ///     Returns true if the two entities are not contained, or are contained in the same container, or if one
         ///     entity contains the other (i.e., is the parent).
@@ -469,21 +445,6 @@ namespace Robust.Shared.Containers
             return userContainer == otherContainer;
         }
 
-        [Obsolete("Use Entity<T> variant")]
-        public bool IsInSameOrTransparentContainer(
-            EntityUid user,
-            EntityUid other,
-            BaseContainer? userContainer = null,
-            BaseContainer? otherContainer = null,
-            bool userSeeInsideSelf = false)
-        {
-            return IsInSameOrTransparentContainer((user, null),
-                other,
-                userContainer,
-                otherContainer,
-                userSeeInsideSelf);
-        }
-
         /// <summary>
         ///     Check whether a given entity can see another entity despite whatever containers they may be in.
         /// </summary>
@@ -606,7 +567,7 @@ namespace Robust.Shared.Containers
         /// <param name="force">Whether to forcibly remove the entity from the container.</param>
         /// <param name="wasInContainer">Whether the entity was actually inside a container or not.</param>
         /// <returns>If the entity could be removed. Also returns false if it wasn't inside a container.</returns>
-        public bool TryRemoveFromContainer(EntityUid entity, bool force, out bool wasInContainer)
+        public bool TryRemoveFromContainer(Entity<TransformComponent?, MetaDataComponent?> entity, bool force, out bool wasInContainer)
         {
             DebugTools.Assert(Exists(entity));
 
@@ -631,7 +592,7 @@ namespace Robust.Shared.Containers
         /// <param name="entity">Entity that might be inside a container.</param>
         /// <param name="force">Whether to forcibly remove the entity from the container.</param>
         /// <returns>If the entity could be removed. Also returns false if it wasn't inside a container.</returns>
-        public bool TryRemoveFromContainer(EntityUid entity, bool force = false)
+        public bool TryRemoveFromContainer(Entity<TransformComponent?, MetaDataComponent?> entity, bool force = false)
         {
             return TryRemoveFromContainer(entity, force, out _);
         }
@@ -678,9 +639,8 @@ namespace Robust.Shared.Containers
         {
             // TODO make this check upwards for any container, and parent to that.
             // Currently this just checks the direct parent, so entities will still teleport through containers.
-
             if (!transform.Comp.ParentUid.IsValid()
-                || !TryGetContainingContainer(transform.Comp.ParentUid, out var container)
+                || !TryGetContainingContainer((transform.Comp.ParentUid, Transform(transform.Comp.ParentUid)), out var container)
                 || !TryInsertIntoContainer(transform, container))
             {
                 _transform.AttachToGridOrMap(transform, transform.Comp);
@@ -692,8 +652,9 @@ namespace Robust.Shared.Containers
             if (Insert((transform.Owner, transform.Comp, null, null), container))
                 return true;
 
-            if (Transform(container.Owner).ParentUid.IsValid()
-                && TryGetContainingContainer(container.Owner, out var newContainer))
+            var ownerXform = Transform(container.Owner);
+            if (ownerXform.ParentUid.IsValid()
+                && TryGetContainingContainer((container.Owner, ownerXform), out var newContainer))
                 return TryInsertIntoContainer(transform, newContainer);
 
             return false;

Robust.Shared/ContentPack/DirLoader.cs

@@ -60,9 +60,7 @@ namespace Robust.Shared.ContentPack
 
             internal string GetPath(ResPath relPath)
             {
-                return Path.GetFullPath(Path.Combine(_directory.FullName, relPath.ToRelativeSystemPath()))
-                    // Sanitise platform-specific path and standardize it for engine use.
-                    .Replace(Path.DirectorySeparatorChar, '/');
+                return PathHelpers.SafeGetResourcePath(_directory.FullName, relPath);
             }
 
             /// <inheritdoc />

Robust.Shared/ContentPack/IResourceManagerInternal.cs

@@ -14,7 +14,11 @@ namespace Robust.Shared.ContentPack
         /// The directory to use for user data.
         /// If null, a virtual temporary file system is used instead.
         /// </param>
-        void Initialize(string? userData);
+        /// <param name="hideUserDataDir">
+        /// If true, <see cref="IWritableDirProvider.RootDir"/> will be hidden on
+        /// <see cref="IResourceManager.UserData"/>.
+        /// </param>
+        void Initialize(string? userData, bool hideUserDataDir);
 
         /// <summary>
         ///     Mounts a single stream as a content file. Useful for unit testing.

Robust.Shared/ContentPack/IWritableDirProvider.cs

@@ -13,7 +13,7 @@ namespace Robust.Shared.ContentPack
     {
         /// <summary>
         /// The root path of this provider.
-        /// Can be null if it's a virtual provider.
+        /// Can be null if it's a virtual provider or the path is protected (e.g. on the client).
         /// </summary>
         string? RootDir { get; }
 

Robust.Shared/ContentPack/PathHelpers.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Runtime.InteropServices;
+using Robust.Shared.Utility;
 
 namespace Robust.Shared.ContentPack
 {
@@ -63,5 +64,27 @@ namespace Robust.Shared.ContentPack
             !OperatingSystem.IsWindows()
             && !OperatingSystem.IsMacOS();
 
+
+        internal static string SafeGetResourcePath(string baseDir, ResPath path)
+        {
+            var relSysPath = path.ToRelativeSystemPath();
+            if (relSysPath.Contains("\\..") || relSysPath.Contains("/.."))
+            {
+                // Hard cap on any exploit smuggling a .. in there.
+                // Since that could allow leaving sandbox.
+                throw new InvalidOperationException($"This branch should never be reached. Path: {path}");
+            }
+
+            var retPath = Path.GetFullPath(Path.Join(baseDir, relSysPath));
+            // better safe than sorry check
+            if (!retPath.StartsWith(baseDir))
+            {
+                // Allow path to match if it's just missing the directory separator at the end.
+                if (retPath != baseDir.TrimEnd('\\'))
+                    throw new InvalidOperationException($"This branch should never be reached. Path: {path}");
+            }
+
+            return retPath;
+        }
     }
 }

Robust.Shared/ContentPack/ResourceManager.cs

@@ -41,13 +41,13 @@ namespace Robust.Shared.ContentPack
         public IWritableDirProvider UserData { get; private set; } = default!;
 
         /// <inheritdoc />
-        public virtual void Initialize(string? userData)
+        public virtual void Initialize(string? userData, bool hideRootDir)
         {
             Sawmill = _logManager.GetSawmill("res");
 
             if (userData != null)
             {
-                UserData = new WritableDirProvider(Directory.CreateDirectory(userData));
+                UserData = new WritableDirProvider(Directory.CreateDirectory(userData), hideRootDir);
             }
             else
             {
@@ -379,6 +379,10 @@ namespace Robust.Shared.ContentPack
                 {
                     var rootDir = loader.GetPath(new ResPath(@"/"));
 
+                    // TODO: GET RID OF THIS.
+                    // This code shouldn't be passing OS disk paths through ResPath.
+                    rootDir = rootDir.Replace(Path.DirectorySeparatorChar, '/');
+
                     yield return new ResPath(rootDir);
                 }
             }

Robust.Shared/ContentPack/WritableDirProvider.cs

@@ -10,17 +10,22 @@ namespace Robust.Shared.ContentPack
     /// <inheritdoc />
     internal sealed class WritableDirProvider : IWritableDirProvider
     {
-        /// <inheritdoc />
+        private readonly bool _hideRootDir;
+
         public string RootDir { get; }
 
+        string? IWritableDirProvider.RootDir => _hideRootDir ? null : RootDir;
+
         /// <summary>
         /// Constructs an instance of <see cref="WritableDirProvider"/>.
         /// </summary>
         /// <param name="rootDir">Root file system directory to allow writing.</param>
-        public WritableDirProvider(DirectoryInfo rootDir)
+        /// <param name="hideRootDir">If true, <see cref="IWritableDirProvider.RootDir"/> is reported as null.</param>
+        public WritableDirProvider(DirectoryInfo rootDir, bool hideRootDir)
         {
             // FullName does not have a trailing separator, and we MUST have a separator.
             RootDir = rootDir.FullName + Path.DirectorySeparatorChar.ToString();
+            _hideRootDir = hideRootDir;
         }
 
         #region File Access
@@ -119,7 +124,7 @@ namespace Robust.Shared.ContentPack
                 throw new FileNotFoundException();
 
             var dirInfo = new DirectoryInfo(GetFullPath(path));
-            return new WritableDirProvider(dirInfo);
+            return new WritableDirProvider(dirInfo, _hideRootDir);
         }
 
         /// <inheritdoc />
@@ -180,20 +185,7 @@ namespace Robust.Shared.ContentPack
 
             path = path.Clean();
 
-            return GetFullPath(RootDir, path);
-        }
-
-        private static string GetFullPath(string root, ResPath path)
-        {
-            var relPath = path.ToRelativeSystemPath();
-            if (relPath.Contains("\\..") || relPath.Contains("/.."))
-            {
-                // Hard cap on any exploit smuggling a .. in there.
-                // Since that could allow leaving sandbox.
-                throw new InvalidOperationException($"This branch should never be reached. Path: {path}");
-            }
-
-            return Path.GetFullPath(Path.Combine(root, relPath));
+            return PathHelpers.SafeGetResourcePath(RootDir, path);
         }
     }
 }

Robust.Shared/EntitySerialization/EntityDeserializer.cs

@@ -547,19 +547,20 @@ public sealed class EntityDeserializer :
         _stopwatch.Restart();
         foreach (var (entity, data) in Entities)
         {
+#if EXCEPTION_TOLERANCE
             try
             {
+#endif
                 CurrentReadingEntity = data;
                 LoadEntity(entity, _metaQuery.Comp(entity), data.Components, data.MissingComponents);
+#if EXCEPTION_TOLERANCE
             }
             catch (Exception e)
             {
-#if !EXCEPTION_TOLERANCE
-                throw;
-#endif
                 ToDelete.Add(entity);
                 _log.Error($"Encountered error while loading entity. Yaml uid: {data.YamlId}. Loaded loaded entity: {EntMan.ToPrettyString(entity)}. Error:\n{e}.");
             }
+#endif
         }
 
         CurrentReadingEntity = null;

Robust.Shared/EntitySerialization/EntitySerializer.cs

@@ -162,8 +162,8 @@ public sealed class EntitySerializer : ISerializationContext,
         _log = _logMan.GetSawmill("entity_serializer");
         SerializerProvider.RegisterSerializer(this);
 
-        _metaName = _factory.GetComponentName(typeof(MetaDataComponent));
-        _xformName = _factory.GetComponentName(typeof(TransformComponent));
+        _metaName = _factory.GetComponentName<MetaDataComponent>();
+        _xformName = _factory.GetComponentName<TransformComponent>();
         _emptyMetaNode = _serialization.WriteValueAs<MappingDataNode>(typeof(MetaDataComponent), new MetaDataComponent(), alwaysWrite: true, context: this);
 
         CurrentComponent = _xformName;

Robust.Shared/EntitySerialization/Systems/MapLoaderSystem.Load.cs

@@ -41,6 +41,31 @@ public sealed partial class MapLoaderSystem
         return true;
     }
 
+    /// <summary>
+    /// Tries to load entities from a YAML file, taking in a raw byte stream.
+    /// </summary>
+    /// <param name="file">The file contents to load from.</param>
+    /// <param name="fileName">
+    /// The name of the file being loaded. This is used purely for logging/informational purposes.
+    /// </param>
+    /// <param name="result">The result of the load operation.</param>
+    /// <param name="options">Options for the load operation.</param>
+    /// <returns>True if the load succeeded, false otherwise.</returns>
+    /// <seealso cref="M:Robust.Shared.EntitySerialization.Systems.MapLoaderSystem.TryLoadGeneric(Robust.Shared.Utility.ResPath,Robust.Shared.EntitySerialization.LoadResult@,System.Nullable{Robust.Shared.EntitySerialization.MapLoadOptions})"/>
+    public bool TryLoadGeneric(
+        Stream file,
+        string fileName,
+        [NotNullWhen(true)] out LoadResult? result,
+        MapLoadOptions? options = null)
+    {
+        result = null;
+
+        if (!TryReadFile(new StreamReader(file), out var data))
+            return false;
+
+        return TryLoadGeneric(data, fileName, out result, options);
+    }
+
     /// <summary>
     /// Tries to load entities from a yaml file. Whenever possible, you should try to use <see cref="TryLoadMap"/>,
     /// <see cref="TryLoadGrid"/>, or <see cref="TryLoadEntity"/> instead.
@@ -55,6 +80,17 @@ public sealed partial class MapLoaderSystem
         if (!TryReadFile(file, out var data))
             return false;
 
+        return TryLoadGeneric(data, file.ToString(), out result, options);
+    }
+
+    private bool TryLoadGeneric(
+        MappingDataNode data,
+        string fileName,
+        [NotNullWhen(true)] out LoadResult? result,
+        MapLoadOptions? options = null)
+    {
+        result = null;
+
         _stopwatch.Restart();
         var ev = new BeforeEntityReadEvent();
         RaiseLocalEvent(ev);
@@ -85,7 +121,7 @@ public sealed partial class MapLoaderSystem
 
         if (!deserializer.TryProcessData())
         {
-            Log.Debug($"Failed to process entity data in {file}");
+            Log.Debug($"Failed to process entity data in {fileName}");
             return false;
         }
 
@@ -95,7 +131,7 @@ public sealed partial class MapLoaderSystem
         }
         catch (Exception e)
         {
-            Log.Error($"Caught exception while creating entities for map {file}: {e}");
+            Log.Error($"Caught exception while creating entities for map {fileName}: {e}");
             Delete(deserializer.Result);
             throw;
         }
@@ -103,7 +139,7 @@ public sealed partial class MapLoaderSystem
         if (opts.ExpectedCategory is { } exp && exp != deserializer.Result.Category)
         {
             // Did someone try to load a map file as a grid or vice versa?
-            Log.Error($"Map {file} does not contain the expected data. Expected {exp} but got {deserializer.Result.Category}");
+            Log.Error($"Map {fileName} does not contain the expected data. Expected {exp} but got {deserializer.Result.Category}");
             Delete(deserializer.Result);
             return false;
         }

Robust.Shared/EntitySerialization/Systems/MapLoaderSystem.cs

@@ -64,6 +64,13 @@ public sealed partial class MapLoaderSystem : EntitySystem
             return false;
 
         Log.Info($"Loading file: {resPath}");
+        return TryReadFile(reader, out data);
+    }
+
+    private bool TryReadFile(TextReader reader, [NotNullWhen(true)] out MappingDataNode? data)
+    {
+        data = null;
+
         _stopwatch.Restart();
 
         using var textReader = reader;

Robust.Shared/GameObjects/Components/Transform/TransformComponent.cs

@@ -633,7 +633,7 @@ namespace Robust.Shared.GameObjects
     ///     An invalid entity UID indicates that this entity has intentionally been removed from broadphases and should
     ///     not automatically be re-added by movement events.
     /// </remarks>
-    internal record struct BroadphaseData(EntityUid Uid, EntityUid PhysicsMap, bool CanCollide, bool Static)
+    internal record struct BroadphaseData(EntityUid Uid, bool CanCollide, bool Static)
     {
         public bool IsValid() => Uid.IsValid();
         public bool Valid => IsValid();

Robust.Shared/GameObjects/EntityManager.Spawn.cs

@@ -4,6 +4,7 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
+using Robust.Shared.Collections;
 using Robust.Shared.Containers;
 using Robust.Shared.Maths;
 using Robust.Shared.Serialization;
@@ -84,12 +85,17 @@ public partial class EntityManager
         return ents;
     }
 
-    public void SpawnEntitiesAttachedTo(EntityCoordinates coordinates, IEnumerable<EntProtoId> protoNames)
+    public EntityUid[] SpawnEntitiesAttachedTo(EntityCoordinates coordinates, IEnumerable<EntProtoId> protoNames)
     {
+        var ents = new ValueList<EntityUid>();
+
         foreach (var protoName in protoNames)
         {
-            SpawnAttachedTo(protoName, coordinates);
+            var uid = SpawnAttachedTo(protoName, coordinates);
+            ents.Add(uid);
         }
+
+        return ents.ToArray();
     }
 
     public virtual EntityUid SpawnAttachedTo(string? protoName, EntityCoordinates coordinates, ComponentRegistry? overrides = null, Angle rotation = default)

Robust.Shared/GameObjects/EntityManager.cs

@@ -161,7 +161,7 @@ namespace Robust.Shared.GameObjects
         /// <summary>
         /// Returns true if the entity's data (apart from transform) is default.
         /// </summary>
-        public bool IsDefault(EntityUid uid)
+        public bool IsDefault(EntityUid uid, ICollection<string>? ignoredComps = null)
         {
             if (!MetaQuery.TryGetComponent(uid, out var metadata) || metadata.EntityPrototype == null)
                 return false;
@@ -195,6 +195,9 @@ namespace Robust.Shared.GameObjects
 
                 var compName = _componentFactory.GetComponentName(compType);
 
+                if (ignoredComps?.Contains(compName) == true)
+                    continue;
+
                 // If the component isn't on the prototype then it's custom.
                 if (!protoData.TryGetValue(compName, out var protoMapping))
                     return false;
@@ -498,7 +501,7 @@ namespace Robust.Shared.GameObjects
             if (Deleted(uid.Value))
                 return false;
 
-            if (!QueuedDeletionsSet.Add(uid.Value))
+            if (QueuedDeletionsSet.Contains(uid.Value))
                 return false;
 
             QueueDeleteEntity(uid);

Robust.Shared/GameObjects/EntitySystem.Proxy.cs

@@ -665,7 +665,7 @@ public partial class EntitySystem
 
     /// <inheritdoc cref="IEntityManager.AddComponent&lt;T&gt;(EntityUid)"/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    protected T AddComp<T>(EntityUid uid) where T :  Component, new()
+    protected T AddComp<T>(EntityUid uid) where T :  IComponent, new()
     {
         return EntityManager.AddComponent<T>(uid);
     }

Robust.Shared/GameObjects/IEntityManager.Spawn.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
+using Robust.Shared.Collections;
 using Robust.Shared.Containers;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
@@ -22,7 +23,7 @@ public partial interface IEntityManager
     EntityUid[] SpawnEntities(MapCoordinates coordinates, params string?[] protoNames);
     EntityUid[] SpawnEntities(MapCoordinates coordinates, string? prototype, int count);
     EntityUid[] SpawnEntities(MapCoordinates coordinates, List<string?> protoNames);
-    void SpawnEntitiesAttachedTo(EntityCoordinates coordinates, IEnumerable<EntProtoId> protoNames);
+    EntityUid[] SpawnEntitiesAttachedTo(EntityCoordinates coordinates, IEnumerable<EntProtoId> protoNames);
     EntityUid[] SpawnEntitiesAttachedTo(EntityCoordinates coordinates, params EntProtoId[] protoNames);
     EntityUid[] SpawnEntitiesAttachedTo(EntityCoordinates coordinates, List<string?> protoNames);
     EntityUid[] SpawnEntitiesAttachedTo(EntityCoordinates coordinates, params string?[] protoNames);

Robust.Shared/GameObjects/Systems/CollideOnAnchorSystem.cs

@@ -18,7 +18,7 @@ namespace Robust.Shared.GameObjects
 
         private void OnStartup(EntityUid uid, CollideOnAnchorComponent component, ComponentStartup args)
         {
-            if (!EntityManager.TryGetComponent(uid, out TransformComponent? transformComponent)) return;
+            if (!TryComp(uid, out TransformComponent? transformComponent)) return;
 
             SetCollide(uid, component, transformComponent.Anchored);
         }
@@ -31,7 +31,7 @@ namespace Robust.Shared.GameObjects
 
         private void SetCollide(EntityUid uid, CollideOnAnchorComponent component, bool anchored)
         {
-            if (!EntityManager.TryGetComponent(uid, out PhysicsComponent? body)) return;
+            if (!TryComp(uid, out PhysicsComponent? body)) return;
 
             var enabled = component.Enable;
 

Robust.Shared/GameObjects/Systems/EntityLookupSystem.cs

@@ -89,7 +89,6 @@ public sealed partial class EntityLookupSystem : EntitySystem
     private EntityQuery<MapGridComponent> _gridQuery;
     private EntityQuery<MetaDataComponent> _metaQuery;
     private EntityQuery<PhysicsComponent> _physicsQuery;
-    private EntityQuery<PhysicsMapComponent> _physMapQuery;
     private EntityQuery<TransformComponent> _xformQuery;
 
     /// <summary>
@@ -119,7 +118,6 @@ public sealed partial class EntityLookupSystem : EntitySystem
         _gridQuery = GetEntityQuery<MapGridComponent>();
         _metaQuery = GetEntityQuery<MetaDataComponent>();
         _physicsQuery = GetEntityQuery<PhysicsComponent>();
-        _physMapQuery = GetEntityQuery<PhysicsMapComponent>();
         _xformQuery = GetEntityQuery<TransformComponent>();
 
         SubscribeLocalEvent<BroadphaseComponent, EntityTerminatingEvent>(OnBroadphaseTerminating);
@@ -153,15 +151,12 @@ public sealed partial class EntityLookupSystem : EntitySystem
     private void OnBroadphaseTerminating(EntityUid uid, BroadphaseComponent component, ref EntityTerminatingEvent args)
     {
         var xform = _xformQuery.GetComponent(uid);
-        var map = xform.MapUid;
-        _physMapQuery.TryGetComponent(map, out var physMap);
-        RemoveChildrenFromTerminatingBroadphase(xform, component, physMap);
+        RemoveChildrenFromTerminatingBroadphase(xform, component);
         RemComp(uid, component);
     }
 
     private void RemoveChildrenFromTerminatingBroadphase(TransformComponent xform,
-        BroadphaseComponent component,
-        PhysicsMapComponent? map)
+        BroadphaseComponent component)
     {
         foreach (var child in xform._children)
         {
@@ -179,19 +174,15 @@ public sealed partial class EntityLookupSystem : EntitySystem
 
             if (childXform.Broadphase.Value.CanCollide && _fixturesQuery.TryGetComponent(child, out var fixtures))
             {
-                if (map == null)
-                    _physMapQuery.TryGetComponent(childXform.Broadphase.Value.PhysicsMap, out map);
-
-                DebugTools.Assert(map == null || childXform.Broadphase.Value.PhysicsMap == map.Owner);
                 var tree = childXform.Broadphase.Value.Static ? component.StaticTree : component.DynamicTree;
                 foreach (var fixture in fixtures.Fixtures.Values)
                 {
-                    DestroyProxies(fixture, tree, map);
+                    DestroyProxies(fixture, tree);
                 }
             }
 
             childXform.Broadphase = null;
-            RemoveChildrenFromTerminatingBroadphase(childXform, component, map);
+            RemoveChildrenFromTerminatingBroadphase(childXform, component);
         }
     }
 
@@ -227,26 +218,18 @@ public sealed partial class EntityLookupSystem : EntitySystem
         if (xform.MapUid == null)
             return;
 
-        if (!_physMapQuery.TryGetComponent(xform.MapUid, out var physMap))
-        {
-            throw new InvalidOperationException(
-                $"Broadphase's map is missing a physics map comp. Broadphase: {ToPrettyString(broadphase.Owner)}");
-        }
-
         var ent = new Entity<TransformComponent, BroadphaseComponent>(broadphase, xform, broadphase);
-        var map = new Entity<PhysicsMapComponent>(xform.MapUid.Value, physMap);
         var enumerator = xform.ChildEnumerator;
         while (enumerator.MoveNext(out var child))
         {
             if (!_broadQuery.HasComp(child))
-                InitializeChild(child, ent, map);
+                InitializeChild(child, ent);
         }
     }
 
     private void InitializeChild(
         EntityUid child,
-        Entity<TransformComponent, BroadphaseComponent> broadphase,
-        Entity<PhysicsMapComponent> map)
+        Entity<TransformComponent, BroadphaseComponent> broadphase)
     {
         if (LifeStage(child) <= EntityLifeStage.PreInit)
             return;
@@ -258,7 +241,6 @@ public sealed partial class EntityLookupSystem : EntitySystem
             if (!xform.Broadphase.Value.IsValid())
                 return; // Entity is intentionally not on a broadphase (deferred updating?).
 
-            _physMapQuery.TryGetComponent(xform.Broadphase.Value.PhysicsMap, out var oldPhysMap);
             if (!_broadQuery.TryGetComponent(xform.Broadphase.Value.Uid, out var oldBroadphase))
             {
                 DebugTools.Assert("Encountered deleted broadphase.");
@@ -275,16 +257,15 @@ public sealed partial class EntityLookupSystem : EntitySystem
             }
             else if (oldBroadphase != broadphase.Comp2)
             {
-                RemoveFromEntityTree(xform.Broadphase.Value.Uid, oldBroadphase, ref oldPhysMap, child, xform);
+                RemoveFromEntityTree(xform.Broadphase.Value.Uid, oldBroadphase,child, xform);
             }
         }
 
-        DebugTools.Assert(xform.Broadphase is not {} x || x.Uid == broadphase.Owner && (!x.CanCollide || x.PhysicsMap == map.Owner));
+        DebugTools.Assert(xform.Broadphase is not {} x || x.Uid == broadphase.Owner && !x.CanCollide);
         AddOrUpdateEntityTree(
             broadphase.Owner,
             broadphase.Comp2,
             broadphase.Comp1,
-            map.Comp,
             child,
             xform);
     }
@@ -315,9 +296,6 @@ public sealed partial class EntityLookupSystem : EntitySystem
         if (!TryGetCurrentBroadphase(xform, out var broadphase))
             return;
 
-        if (!_physMapQuery.TryGetComponent(xform.MapUid, out var physMap))
-            throw new InvalidOperationException();
-
         var (worldPos, worldRot) = _transform.GetWorldPositionRotation(xform);
         var mapTransform = new Transform(worldPos, worldRot);
 
@@ -326,10 +304,10 @@ public sealed partial class EntityLookupSystem : EntitySystem
         var tree = body.BodyType == BodyType.Static ? broadphase.StaticTree : broadphase.DynamicTree;
         DebugTools.Assert(fixture.ProxyCount == 0);
 
-        AddOrMoveProxies(uid, fixtureId, fixture, body, tree, broadphaseTransform, mapTransform, physMap.MoveBuffer);
+        AddOrMoveProxies((uid, body, xform), fixtureId, fixture, tree, broadphaseTransform);
     }
 
-    internal void DestroyProxies(EntityUid uid, string fixtureId, Fixture fixture, TransformComponent xform, BroadphaseComponent broadphase, PhysicsMapComponent? physicsMap)
+    internal void DestroyProxies(EntityUid uid, string fixtureId, Fixture fixture, TransformComponent xform, BroadphaseComponent broadphase)
     {
         DebugTools.AssertNotNull(xform.Broadphase);
         DebugTools.Assert(xform.Broadphase!.Value.Uid == broadphase.Owner);
@@ -344,7 +322,7 @@ public sealed partial class EntityLookupSystem : EntitySystem
         }
 
         var tree = xform.Broadphase.Value.Static ? broadphase.StaticTree : broadphase.DynamicTree;
-        DestroyProxies(fixture, tree, physicsMap);
+        DestroyProxies(fixture, tree);
     }
 
     #endregion
@@ -395,8 +373,7 @@ public sealed partial class EntityLookupSystem : EntitySystem
         var fixtures = Comp<FixturesComponent>(uid);
         if (old.CanCollide)
         {
-            _physMapQuery.TryGetComponent(old.PhysicsMap, out var physicsMap);
-            RemoveBroadTree(broadphase, fixtures, old.Static, physicsMap);
+            RemoveBroadTree(broadphase, fixtures, old.Static);
         }
         else
             (old.Static ? broadphase.StaticSundriesTree : broadphase.SundriesTree).Remove(uid);
@@ -408,23 +385,23 @@ public sealed partial class EntityLookupSystem : EntitySystem
             AddOrUpdateSundriesTree(old.Uid, broadphase, uid, xform, body.BodyType == BodyType.Static);
     }
 
-    private void RemoveBroadTree(BroadphaseComponent lookup, FixturesComponent manager, bool staticBody, PhysicsMapComponent? map)
+    private void RemoveBroadTree(BroadphaseComponent lookup, FixturesComponent manager, bool staticBody)
     {
         var tree = staticBody ? lookup.StaticTree : lookup.DynamicTree;
         foreach (var fixture in manager.Fixtures.Values)
         {
-            DestroyProxies(fixture, tree, map);
+            DestroyProxies(fixture, tree);
         }
     }
 
-    internal void DestroyProxies(Fixture fixture, IBroadPhase tree, PhysicsMapComponent? map)
+    internal void DestroyProxies(Fixture fixture, IBroadPhase tree)
     {
-        var buffer = map?.MoveBuffer;
+        var buffer = _physics.MoveBuffer;
         for (var i = 0; i < fixture.ProxyCount; i++)
         {
             var proxy = fixture.Proxies[i];
             tree.RemoveProxy(proxy.ProxyId);
-            buffer?.Remove(proxy);
+            buffer.Remove(proxy);
         }
 
         fixture.ProxyCount = 0;
@@ -438,10 +415,7 @@ public sealed partial class EntityLookupSystem : EntitySystem
         if (broadphaseXform.MapID == MapId.Nullspace)
             return;
 
-        if (!_physMapQuery.TryGetComponent(broadphaseXform.MapUid, out var physMap))
-            throw new InvalidOperationException($"Physics Broadphase is missing physics map. {ToPrettyString(broadUid)}");
-
-        AddOrUpdatePhysicsTree(uid, broadUid, broadphase, broadphaseXform, physMap, xform, body, fixtures);
+        AddOrUpdatePhysicsTree(uid, broadUid, broadphase, broadphaseXform, xform, body, fixtures);
     }
 
     private void AddOrUpdatePhysicsTree(
@@ -449,16 +423,15 @@ public sealed partial class EntityLookupSystem : EntitySystem
         EntityUid broadUid,
         BroadphaseComponent broadphase,
         TransformComponent broadphaseXform,
-        PhysicsMapComponent physicsMap,
         TransformComponent xform,
         PhysicsComponent body,
         FixturesComponent manager)
     {
         DebugTools.Assert(!_container.IsEntityOrParentInContainer(body.Owner, null, xform));
-        DebugTools.Assert(xform.Broadphase == null || xform.Broadphase == new BroadphaseData(broadphase.Owner, physicsMap.Owner, body.CanCollide, body.BodyType == BodyType.Static));
+        DebugTools.Assert(xform.Broadphase == null || xform.Broadphase == new BroadphaseData(broadphase.Owner, body.CanCollide, body.BodyType == BodyType.Static));
         DebugTools.Assert(broadphase.Owner == broadUid);
 
-        xform.Broadphase ??= new(broadUid, physicsMap.Owner, body.CanCollide, body.BodyType == BodyType.Static);
+        xform.Broadphase ??= new(broadUid, body.CanCollide, body.BodyType == BodyType.Static);
         var tree = body.BodyType == BodyType.Static ? broadphase.StaticTree : broadphase.DynamicTree;
 
         // TOOD optimize this. This function iterates UP through parents, while we are currently iterating down.
@@ -470,20 +443,19 @@ public sealed partial class EntityLookupSystem : EntitySystem
 
         foreach (var (id, fixture) in manager.Fixtures)
         {
-            AddOrMoveProxies(uid, id, fixture, body, tree, broadphaseTransform, mapTransform, physicsMap.MoveBuffer);
+            AddOrMoveProxies((uid, body, xform), id, fixture, tree, broadphaseTransform);
         }
     }
 
     private void AddOrMoveProxies(
-        EntityUid uid,
+        Entity<PhysicsComponent, TransformComponent> ent,
         string fixtureId,
         Fixture fixture,
-        PhysicsComponent body,
         IBroadPhase tree,
-        Transform broadphaseTransform,
-        Transform mapTransform,
-        Dictionary<FixtureProxy, Box2> moveBuffer)
+        Transform broadphaseTransform)
     {
+        var moveBuffer = _physics.MoveBuffer;
+
         // Moving
         if (fixture.ProxyCount > 0)
         {
@@ -493,7 +465,7 @@ public sealed partial class EntityLookupSystem : EntitySystem
                 var proxy = fixture.Proxies[i];
                 tree.MoveProxy(proxy.ProxyId, bounds);
                 proxy.AABB = bounds;
-                moveBuffer[proxy] = fixture.Shape.ComputeAABB(mapTransform, i);
+                moveBuffer.Add(proxy);
             }
 
             return;
@@ -505,11 +477,11 @@ public sealed partial class EntityLookupSystem : EntitySystem
         for (var i = 0; i < count; i++)
         {
             var bounds = fixture.Shape.ComputeAABB(broadphaseTransform, i);
-            var proxy = new FixtureProxy(uid, body, bounds, fixtureId, fixture, i);
+            var proxy = new FixtureProxy(ent.Owner, ent.Comp1, ent.Comp2, bounds, fixtureId, fixture, i);
             proxy.ProxyId = tree.AddProxy(ref proxy);
             proxy.AABB = bounds;
             proxies[i] = proxy;
-            moveBuffer[proxy] = fixture.Shape.ComputeAABB(mapTransform, i);
+            moveBuffer.Add(proxy);
         }
 
         fixture.Proxies = proxies;
@@ -519,8 +491,8 @@ public sealed partial class EntityLookupSystem : EntitySystem
     private void AddOrUpdateSundriesTree(EntityUid broadUid, BroadphaseComponent broadphase, EntityUid uid, TransformComponent xform, bool staticBody, Box2? aabb = null)
     {
         DebugTools.Assert(!_container.IsEntityOrParentInContainer(uid));
-        DebugTools.Assert(xform.Broadphase == null || xform.Broadphase == new BroadphaseData(broadUid, default, false, staticBody));
-        xform.Broadphase ??= new(broadUid, default, false, staticBody);
+        DebugTools.Assert(xform.Broadphase == null || xform.Broadphase == new BroadphaseData(broadUid, false, staticBody));
+        xform.Broadphase ??= new(broadUid, false, staticBody);
         (staticBody ? broadphase.StaticSundriesTree : broadphase.SundriesTree).AddOrUpdate(uid, aabb);
     }
 
@@ -538,8 +510,12 @@ public sealed partial class EntityLookupSystem : EntitySystem
     {
         if (args.Component.GridUid == args.Sender)
         {
-            if (args.ParentChanged) // grid changed maps, need to update children and clear the move buffer.
+            // If grid changes map MoveBuffer will have incorrect worldpositions for all children.
+            if (args.ParentChanged)
+            {
                 OnGridChangedMap(args);
+            }
+
             return;
         }
         DebugTools.Assert(!_gridQuery.HasComp(args.Sender));
@@ -563,84 +539,21 @@ public sealed partial class EntityLookupSystem : EntitySystem
             return;
 
         // We need to recursively update the cached data and remove children from the move buffer
-        DebugTools.Assert(_gridQuery.HasComp(args.Sender));
-        DebugTools.Assert(!newMap.IsValid() || _mapQuery.HasComp(newMap));
-        DebugTools.Assert(!oldMap.IsValid() || _mapQuery.HasComp(oldMap));
-
-        var oldBuffer = _physMapQuery.CompOrNull(oldMap)?.MoveBuffer;
-        var newBuffer = _physMapQuery.CompOrNull(newMap)?.MoveBuffer;
-
-        foreach (var child in args.Component._children)
-        {
-            RecursiveOnGridChangedMap(child, oldMap, newMap, oldBuffer, newBuffer);
-        }
-    }
-
-    private void RecursiveOnGridChangedMap(
-        EntityUid uid,
-        EntityUid oldMap,
-        EntityUid newMap,
-        Dictionary<FixtureProxy, Box2>? oldBuffer,
-        Dictionary<FixtureProxy, Box2>? newBuffer)
-    {
-        if (!_xformQuery.TryGetComponent(uid, out var xform))
-            return;
-
-        foreach (var child in xform._children)
-        {
-            RecursiveOnGridChangedMap(child, oldMap, newMap, oldBuffer, newBuffer);
-        }
-
-        if (xform.Broadphase == null || !xform.Broadphase.Value.CanCollide)
-            return;
-
-        DebugTools.Assert(_netMan.IsClient || !xform.Broadphase.Value.PhysicsMap.IsValid() || xform.Broadphase.Value.PhysicsMap == oldMap);
-        xform.Broadphase = xform.Broadphase.Value with { PhysicsMap = newMap };
-
-        if (!_fixturesQuery.TryGetComponent(uid, out var fixtures))
-            return;
-
-        if (oldBuffer != null)
-        {
-            foreach (var fix in fixtures.Fixtures.Values)
-            foreach (var prox in fix.Proxies)
-            {
-                oldBuffer.Remove(prox);
-            }
-        }
-
-        if (newBuffer == null)
-            return;
-
-        // TODO PERFORMANCE
-        // track world position while recursively iterating down through children.
-        var (worldPos, worldRot) = _transform.GetWorldPositionRotation(xform);
-        var mapTransform = new Transform(worldPos, worldRot);
-
-        foreach (var fixture in fixtures.Fixtures.Values)
-        {
-            for (var i = 0; i < fixture.ProxyCount; i++)
-            {
-                var proxy = fixture.Proxies[i];
-                newBuffer[proxy] = fixture.Shape.ComputeAABB(mapTransform, i);
-            }
-        }
+        DebugTools.Assert(HasComp<MapGridComponent>(args.Sender));
+        DebugTools.Assert(!newMap.IsValid() || HasComp<MapComponent>(newMap));
+        DebugTools.Assert(!oldMap.IsValid() || HasComp<MapComponent>(oldMap));
     }
 
     private void UpdateParent(EntityUid uid, TransformComponent xform)
     {
         BroadphaseComponent? oldBroadphase = null;
-        PhysicsMapComponent? oldPhysMap = null;
         if (xform.Broadphase != null)
         {
             if (!xform.Broadphase.Value.IsValid())
                 return; // Entity is intentionally not on a broadphase (deferred updating?).
 
-            _physMapQuery.TryGetComponent(xform.Broadphase.Value.PhysicsMap, out oldPhysMap);
-
             if (!_broadQuery.TryGetComponent(xform.Broadphase.Value.Uid, out oldBroadphase))
             {
-
                 DebugTools.Assert("Encountered deleted broadphase.");
 
                 // broadphase was probably deleted.
@@ -661,24 +574,18 @@ public sealed partial class EntityLookupSystem : EntitySystem
 
         if (oldBroadphase != null && oldBroadphase != newBroadphase)
         {
-            RemoveFromEntityTree(oldBroadphase.Owner, oldBroadphase, ref oldPhysMap, uid, xform);
+            RemoveFromEntityTree(oldBroadphase.Owner, oldBroadphase, uid, xform);
         }
 
         if (newBroadphase == null)
             return;
 
         var newBroadphaseXform = _xformQuery.GetComponent(newBroadphase.Owner);
-        if (!_physMapQuery.TryGetComponent(newBroadphaseXform.MapUid, out var physMap))
-        {
-            throw new InvalidOperationException(
-                $"Broadphase's map is missing a physics map comp. Broadphase: {ToPrettyString(newBroadphase.Owner)}");
-        }
 
         AddOrUpdateEntityTree(
             newBroadphase.Owner,
             newBroadphase,
             newBroadphaseXform,
-            physMap,
             uid,
             xform);
     }
@@ -713,17 +620,11 @@ public sealed partial class EntityLookupSystem : EntitySystem
         bool recursive = true)
     {
         var broadphaseXform = _xformQuery.GetComponent(broadphase.Owner);
-        if (!_physMapQuery.TryGetComponent(broadphaseXform.MapUid, out var physMap))
-        {
-            throw new InvalidOperationException(
-                $"Broadphase's map is missing a physics map comp. Broadphase: {ToPrettyString(broadphase.Owner)}");
-        }
 
         AddOrUpdateEntityTree(
             broadUid,
             broadphase,
             broadphaseXform,
-            physMap,
             uid,
             xform,
             recursive);
@@ -733,7 +634,6 @@ public sealed partial class EntityLookupSystem : EntitySystem
         EntityUid broadUid,
         BroadphaseComponent broadphase,
         TransformComponent broadphaseXform,
-        PhysicsMapComponent physicsMap,
         EntityUid uid,
         TransformComponent xform,
         bool recursive = true)
@@ -758,7 +658,7 @@ public sealed partial class EntityLookupSystem : EntitySystem
         }
         else
         {
-            AddOrUpdatePhysicsTree(uid, broadUid, broadphase, broadphaseXform, physicsMap, xform, body, _fixturesQuery.GetComponent(uid));
+            AddOrUpdatePhysicsTree(uid, broadUid, broadphase, broadphaseXform, xform, body, _fixturesQuery.GetComponent(uid));
         }
 
         if (xform.ChildCount == 0 || !recursive)
@@ -771,7 +671,7 @@ public sealed partial class EntityLookupSystem : EntitySystem
             foreach (var child in xform._children)
             {
                 var childXform = _xformQuery.GetComponent(child);
-                AddOrUpdateEntityTree(broadUid, broadphase, broadphaseXform, physicsMap, child, childXform, recursive);
+                AddOrUpdateEntityTree(broadUid, broadphase, broadphaseXform, child, childXform, recursive);
             }
             return;
         }
@@ -782,7 +682,7 @@ public sealed partial class EntityLookupSystem : EntitySystem
                 continue;
 
             var childXform = _xformQuery.GetComponent(child);
-            AddOrUpdateEntityTree(broadUid, broadphase, broadphaseXform, physicsMap, child, childXform, recursive);
+            AddOrUpdateEntityTree(broadUid, broadphase, broadphaseXform, child, childXform, recursive);
         }
     }
 
@@ -794,16 +694,10 @@ public sealed partial class EntityLookupSystem : EntitySystem
         if (!TryGetCurrentBroadphase(xform, out var broadphase))
             return;
 
-        DebugTools.Assert(!_gridQuery.HasComp(uid));
-        DebugTools.Assert(!_mapQuery.HasComp(uid));
-        PhysicsMapComponent? physMap = null;
-        if (xform.Broadphase!.Value.PhysicsMap is { Valid: true } map && !_physMapQuery.TryGetComponent(map, out physMap))
-        {
-            throw new InvalidOperationException(
-                $"Broadphase's map is missing a physics map comp. Broadphase: {ToPrettyString(broadphase.Owner)}");
-        }
+        DebugTools.Assert(!HasComp<MapGridComponent>(uid));
+        DebugTools.Assert(!HasComp<MapComponent>(uid));
 
-        RemoveFromEntityTree(broadphase.Owner, broadphase, ref physMap, uid, xform);
+        RemoveFromEntityTree(broadphase.Owner, broadphase, uid, xform);
     }
 
     /// <summary>
@@ -812,7 +706,6 @@ public sealed partial class EntityLookupSystem : EntitySystem
     private void RemoveFromEntityTree(
         EntityUid broadUid,
         BroadphaseComponent broadphase,
-        ref PhysicsMapComponent? physicsMap,
         EntityUid uid,
         TransformComponent xform,
         bool recursive = true)
@@ -833,16 +726,9 @@ public sealed partial class EntityLookupSystem : EntitySystem
             broadUid = old.Uid;
         }
 
-        if (old.PhysicsMap.IsValid() && physicsMap?.Owner != old.PhysicsMap)
-        {
-            if (!_physMapQuery.TryGetComponent(old.PhysicsMap, out physicsMap))
-                Log.Error($"Entity {ToPrettyString(uid)} has missing physics map?");
-        }
-
         if (old.CanCollide)
         {
-            DebugTools.Assert(old.PhysicsMap == (physicsMap?.Owner ?? default));
-            RemoveBroadTree(broadphase, _fixturesQuery.GetComponent(uid), old.Static, physicsMap);
+            RemoveBroadTree(broadphase, _fixturesQuery.GetComponent(uid), old.Static);
         }
         else if (old.Static)
             broadphase.StaticSundriesTree.Remove(uid);
@@ -858,7 +744,6 @@ public sealed partial class EntityLookupSystem : EntitySystem
             RemoveFromEntityTree(
                 broadUid,
                 broadphase,
-                ref physicsMap,
                 child,
                 _xformQuery.GetComponent(child));
         }

Robust.Shared/GameObjects/Systems/PrototypeReloadSystem.cs

@@ -73,8 +73,8 @@ internal sealed class PrototypeReloadSystem : EntitySystem
             var data = newPrototype.Components[name];
             var component = _componentFactory.GetComponent(name);
 
-            if (!EntityManager.HasComponent(entity, component.GetType()))
-                EntityManager.AddComponent(entity, component);
+            if (!HasComp(entity, component.GetType()))
+                AddComp(entity, component);
         }
 
         // Update entity metadata

Robust.Shared/GameObjects/Systems/SharedGridFixtureSystem.cs

@@ -69,19 +69,19 @@ namespace Robust.Shared.GameObjects
             if (!_enabled)
                 return;
 
-            if (!EntityManager.TryGetComponent(uid, out PhysicsComponent? body))
+            if (!TryComp(uid, out PhysicsComponent? body))
             {
                 Log.Error($"Trying to regenerate collision for {uid} that doesn't have {nameof(body)}");
                 return;
             }
 
-            if (!EntityManager.TryGetComponent(uid, out FixturesComponent? manager))
+            if (!TryComp(uid, out FixturesComponent? manager))
             {
                 Log.Error($"Trying to regenerate collision for {uid} that doesn't have {nameof(manager)}");
                 return;
             }
 
-            if (!EntityManager.TryGetComponent(uid, out TransformComponent? xform))
+            if (!TryComp(uid, out TransformComponent? xform))
             {
                 Log.Error($"Trying to regenerate collision for {uid} that doesn't have {nameof(TransformComponent)}");
                 return;

Robust.Shared/GameObjects/Systems/SharedMapSystem.Grid.cs

@@ -158,7 +158,7 @@ public abstract partial class SharedMapSystem
         // Just MapLoader things.
         if (component.MapProxy == DynamicTree.Proxy.Free) return;
 
-        var xform = EntityManager.GetComponent<TransformComponent>(uid);
+        var xform = Comp<TransformComponent>(uid);
         var aabb = GetWorldAABB(uid, component, xform);
 
         if (TryComp<GridTreeComponent>(xform.MapUid, out var gridTree))
@@ -166,10 +166,7 @@ public abstract partial class SharedMapSystem
             gridTree.Tree.MoveProxy(component.MapProxy, in aabb);
         }
 
-        if (TryComp<MovedGridsComponent>(xform.MapUid, out var movedGrids))
-        {
-            movedGrids.MovedGrids.Add(uid);
-        }
+        _physics.MovedGrids.Add(uid);
     }
 
     private void OnGridMove(EntityUid uid, MapGridComponent component, ref MoveEvent args)
@@ -191,10 +188,7 @@ public abstract partial class SharedMapSystem
             gridTree.Tree.MoveProxy(component.MapProxy, in aabb);
         }
 
-        if (TryComp<MovedGridsComponent>(xform.MapUid, out var movedGrids))
-        {
-            movedGrids.MovedGrids.Add(uid);
-        }
+        _physics.MovedGrids.Add(uid);
     }
 
     private void OnParentChange(EntityUid uid, MapGridComponent component, ref MoveEvent args)
@@ -219,23 +213,23 @@ public abstract partial class SharedMapSystem
 
         if (xform.ParentUid != xform.MapUid && meta.EntityLifeStage < EntityLifeStage.Terminating  && _netManager.IsServer)
         {
-            Log.Error($"Grid {ToPrettyString(uid, meta)} is not parented to {ToPrettyString(xform._parent)} which is not a map.  y'all need jesus. {Environment.StackTrace}");
+            Log.Error($"Grid {ToPrettyString(uid, meta)} is parented to {ToPrettyString(xform._parent)} which is not a map.  y'all need jesus. {Environment.StackTrace}");
             return;
         }
 
         // Make sure we cleanup old map for moved grid stuff.
         var oldMap = _transform.ToMapCoordinates(args.OldPosition);
         var oldMapUid = GetMapOrInvalid(oldMap.MapId);
-        if (component.MapProxy != DynamicTree.Proxy.Free && TryComp<MovedGridsComponent>(oldMapUid, out var oldMovedGrids))
+        if (component.MapProxy != DynamicTree.Proxy.Free)
         {
-            oldMovedGrids.MovedGrids.Remove(uid);
+            _physics.MovedGrids.Remove(uid);
             RemoveGrid(uid, component, oldMapUid);
         }
 
         DebugTools.Assert(component.MapProxy == DynamicTree.Proxy.Free);
-        if (TryComp<MovedGridsComponent>(xform.MapUid, out var newMovedGrids))
+        if (xform.MapUid != null)
         {
-            newMovedGrids.MovedGrids.Add(uid);
+            _physics.MovedGrids.Add(uid);
             AddGrid(uid, component);
         }
     }
@@ -344,6 +338,8 @@ public abstract partial class SharedMapSystem
         chunk.SuppressCollisionRegeneration = true;
         DebugTools.Assert(data.TileData.Any(x => !x.IsEmpty));
         DebugTools.Assert(data.TileData.Length == component.ChunkSize * component.ChunkSize);
+        var changedEntry = new ValueList<TileChangedEntry>();
+
         for (ushort x = 0; x < component.ChunkSize; x++)
         {
             for (ushort y = 0; y < component.ChunkSize; y++)
@@ -352,12 +348,15 @@ public abstract partial class SharedMapSystem
                 if (!chunk.TrySetTile(x, y, tile, out var oldTile, out _))
                     continue;
 
-                var gridIndices = chunk.ChunkTileToGridTile((x, y));
-                var newTileRef = new TileRef(uid, gridIndices, tile);
-                _mapInternal.RaiseOnTileChanged(gridEnt, newTileRef, oldTile, index);
+
+                var chunkIndex = new Vector2i(x, y);
+                var gridIndices = chunk.ChunkTileToGridTile(chunkIndex);
+                changedEntry.Add(new TileChangedEntry(tile, oldTile, chunk.Indices, gridIndices));
             }
         }
 
+        var ev = new TileChangedEvent(gridEnt, changedEntry.ToArray());
+        EntityManager.EventBus.RaiseLocalEvent(gridEnt.Owner, ref ev, true);
         DebugTools.Assert(chunk.Fixtures.SetEquals(data.Fixtures));
 
         // These should never refer to the same object
@@ -519,9 +518,9 @@ public abstract partial class SharedMapSystem
                 component.MapProxy = proxy;
             }
 
-            if (TryComp<MovedGridsComponent>(xform.MapUid, out var movedGrids))
+            if (xform.MapUid != null)
             {
-                movedGrids.MovedGrids.Add(uid);
+                _physics.MovedGrids.Add(uid);
             }
         }
 
@@ -573,9 +572,9 @@ public abstract partial class SharedMapSystem
             grid.MapProxy = proxy;
         }
 
-        if (TryComp<MovedGridsComponent>(xform.MapUid, out var movedGrids))
+        if (xform.MapUid != null)
         {
-            movedGrids.MovedGrids.Add(uid);
+            _physics.MovedGrids.Add(uid);
         }
     }
 
@@ -588,9 +587,9 @@ public abstract partial class SharedMapSystem
 
         grid.MapProxy = DynamicTree.Proxy.Free;
 
-        if (TryComp<MovedGridsComponent>(mapUid, out var movedGrids))
+        if (mapUid.IsValid())
         {
-            movedGrids.MovedGrids.Remove(uid);
+            _physics.MovedGrids.Remove(uid);
         }
     }
 

Robust.Shared/GameObjects/Systems/SharedMapSystem.Map.cs

@@ -116,9 +116,7 @@ public abstract partial class SharedMapSystem
     private void OnComponentAdd(EntityUid uid, MapComponent component, ComponentAdd args)
     {
         // ordered startups when
-        EnsureComp<PhysicsMapComponent>(uid);
         EnsureComp<GridTreeComponent>(uid);
-        EnsureComp<MovedGridsComponent>(uid);
     }
 
     internal void AssignMapId(Entity<MapComponent> map, MapId? id = null)

Robust.Shared/GameObjects/Systems/SharedTransformSystem.Component.cs

@@ -1,16 +1,16 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using System.Numerics;
+using System.Runtime.CompilerServices;
 using JetBrains.Annotations;
+using Robust.Shared.Containers;
 using Robust.Shared.GameStates;
 using Robust.Shared.Map;
+using Robust.Shared.Map.Components;
 using Robust.Shared.Maths;
 using Robust.Shared.Physics;
 using Robust.Shared.Utility;
-using System;
-using System.Linq;
-using System.Runtime.CompilerServices;
-using Robust.Shared.Map.Components;
-using System.Diagnostics.CodeAnalysis;
-using System.Numerics;
-using Robust.Shared.Containers;
 
 namespace Robust.Shared.GameObjects;
 
@@ -217,9 +217,10 @@ public abstract partial class SharedTransformSystem
             {
 #if !EXCEPTION_TOLERANCE
                 throw new Exception("Transform is initialising before map ids have been assigned?");
-#endif
+#else
                 Log.Error($"Transform is initialising before map ids have been assigned?");
                 _map.AssignMapId((uid, mapComp));
+#endif
             }
 
             xform.MapUid = uid;

Robust.Shared/GameObjects/Systems/SharedTransformSystem.Coordinates.cs

@@ -53,8 +53,14 @@ public abstract partial class SharedTransformSystem
             return MapCoordinates.Nullspace;
         }
 
-        var worldPos = Vector2.Transform(coordinates.Position, GetWorldMatrix(xform));
-        return new MapCoordinates(worldPos, xform.MapID);
+        Vector2 pos = xform._localRotation.RotateVec(coordinates.Position) + xform._localPosition;
+
+        while (xform.ParentUid != xform.MapUid && xform.ParentUid.IsValid())
+        {
+            xform = XformQuery.GetComponent(xform.ParentUid);
+            pos = xform._localRotation.RotateVec(pos) + xform._localPosition;
+        }
+        return new MapCoordinates(pos, xform.MapID);
     }
 
     /// <summary>
@@ -67,6 +73,41 @@ public abstract partial class SharedTransformSystem
         return ToMapCoordinates(eCoords);
     }
 
+    /// <summary>
+    /// Converts entity-local coordinates into map terms.
+    /// The same as ToMapCoordinates(coordinates, logError).Position, but doesn't have to construct the MapCoordinates first.
+    /// </summary>
+    public Vector2 ToWorldPosition(EntityCoordinates coordinates, bool logError = true)
+    {
+        if (!TryComp(coordinates.EntityId, out TransformComponent? xform))
+        {
+            if (logError)
+                Log.Error($"Attempted to convert coordinates with invalid entity: {coordinates}. Trace: {Environment.StackTrace}");
+            return Vector2.Zero;
+        }
+
+        Vector2 pos = xform._localRotation.RotateVec(coordinates.Position) + xform._localPosition;
+
+        while (xform.ParentUid != xform.MapUid && xform.ParentUid.IsValid())
+        {
+            xform = XformQuery.GetComponent(xform.ParentUid);
+            pos = xform._localRotation.RotateVec(pos) + xform._localPosition;
+        }
+
+        return pos;
+    }
+
+    /// <summary>
+    /// Converts entity-local coordinates into map terms.
+    /// The same as ToMapCoordinates(coordinates).Position, but doesn't have to construct the MapCoordinates first.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public Vector2 ToWorldPosition(NetCoordinates coordinates)
+    {
+        var eCoords = GetCoordinates(coordinates);
+        return ToWorldPosition(eCoords);
+    }
+
     /// <summary>
     /// Creates EntityCoordinates given an entity and some MapCoordinates.
     /// </summary>

Robust.Shared/GameObjects/Systems/SharedTransformSystem.cs

@@ -263,7 +263,7 @@ namespace Robust.Shared.GameObjects
             return true;
         }
 
-        public void RaiseMoveEvent(
+        internal void RaiseMoveEvent(
             Entity<TransformComponent, MetaDataComponent> ent,
             EntityUid oldParent,
             Vector2 oldPosition,

Robust.Shared/GameObjects/Systems/SharedUserInterfaceSystem.cs

@@ -636,7 +636,7 @@ public abstract class SharedUserInterfaceSystem : EntitySystem
         if (!_timing.IsFirstTimePredicted)
             return;
 
-        EntityManager.RaisePredictiveEvent(new BoundUIWrapMessage(GetNetEntity(entity.Owner), new CloseBoundInterfaceMessage(), key));
+        RaisePredictiveEvent(new BoundUIWrapMessage(GetNetEntity(entity.Owner), new CloseBoundInterfaceMessage(), key));
     }
 
     /// <summary>
@@ -685,7 +685,7 @@ public abstract class SharedUserInterfaceSystem : EntitySystem
             {
                 // Not guaranteed to open so rely upon the event handling it.
                 // Also lets client request it to be opened remotely too.
-                EntityManager.RaisePredictiveEvent(new BoundUIWrapMessage(GetNetEntity(entity.Owner), new OpenBoundInterfaceMessage(), key));
+                RaisePredictiveEvent(new BoundUIWrapMessage(GetNetEntity(entity.Owner), new OpenBoundInterfaceMessage(), key));
             }
         }
         else

Robust.Shared/GameObjects/Systems/TimerSystem.cs

@@ -12,7 +12,7 @@ namespace Robust.Shared.GameObjects
             base.Update(frameTime);
 
             // Avoid a collection was modified while enumerating.
-            var timers = EntityManager.EntityQueryEnumerator<TimerComponent>();
+            var timers = EntityQueryEnumerator<TimerComponent>();
             var timersList = new ValueList<(EntityUid, TimerComponent)>();
             while (timers.MoveNext(out var uid, out var timer))
             {
@@ -28,7 +28,7 @@ namespace Robust.Shared.GameObjects
             {
                 if (!timer.Deleted && !EntityManager.Deleted(uid) && timer.RemoveOnEmpty && timer.TimerCount == 0)
                 {
-                    EntityManager.RemoveComponent<TimerComponent>(uid);
+                    RemComp<TimerComponent>(uid);
                 }
             }
         }

Robust.Shared/Localization/LocalizationManager.Functions.cs

@@ -170,10 +170,8 @@ namespace Robust.Shared.Localization
             if (args.Args.Count < 1) return new LocValueString(nameof(Gender.Neuter));
 
             ILocValue entity0 = args.Args[0];
-            if (entity0.Value != null)
+            if (entity0.Value is EntityUid entity)
             {
-                EntityUid entity = (EntityUid)entity0.Value;
-
                 if (_entMan.TryGetComponent(entity, out GrammarComponent? grammar) && grammar.Gender.HasValue)
                 {
                     return new LocValueString(grammar.Gender.Value.ToString().ToLowerInvariant());
@@ -246,10 +244,8 @@ namespace Robust.Shared.Localization
             if (args.Args.Count < 1) return new LocValueString(GetString("zzzz-counter-default"));
 
             ILocValue entity0 = args.Args[0];
-            if (entity0.Value != null)
+            if (entity0.Value is EntityUid entity)
             {
-                EntityUid entity = (EntityUid)entity0.Value;
-
                 if (TryGetEntityLocAttrib(entity, "counter", out var counter))
                 {
                     return new LocValueString(counter);
@@ -292,9 +288,8 @@ namespace Robust.Shared.Localization
             if (args.Args.Count < 2) return new LocValueString("other");
 
             ILocValue entity0 = args.Args[0];
-            if (entity0.Value != null)
+            if (entity0.Value is EntityUid entity)
             {
-                EntityUid entity = (EntityUid)entity0.Value;
                 ILocValue attrib0 = args.Args[1];
                 if (TryGetEntityLocAttrib(entity, attrib0.Format(new LocContext(bundle)), out var attrib))
                 {
@@ -313,10 +308,8 @@ namespace Robust.Shared.Localization
             if (args.Args.Count < 1) return new LocValueString("false");
 
             ILocValue entity0 = args.Args[0];
-            if (entity0.Value != null)
+            if (entity0.Value is EntityUid entity)
             {
-                EntityUid entity = (EntityUid)entity0.Value;
-
                 if (_entMan.TryGetComponent(entity, out GrammarComponent? grammar) && grammar.ProperNoun.HasValue)
                 {
                     return new LocValueString(grammar.ProperNoun.Value.ToString().ToLowerInvariant());

Robust.Shared/Map/Components/MovedGridsComponent.cs

@@ -1,16 +0,0 @@
-using System.Collections.Generic;
-using Robust.Shared.GameObjects;
-using Robust.Shared.GameStates;
-using Robust.Shared.ViewVariables;
-
-namespace Robust.Shared.Map.Components;
-
-/// <summary>
-/// Stores what grids moved in a tick.
-/// </summary>
-[RegisterComponent, NetworkedComponent]
-public sealed partial class MovedGridsComponent : Component
-{
-    [ViewVariables]
-    public HashSet<EntityUid> MovedGrids = new();
-}

Robust.Shared/Map/Enumerators/NearestChunkEnumerator.cs

@@ -0,0 +1,64 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Numerics;
+using Robust.Shared.Collections;
+using Robust.Shared.Maths;
+
+namespace Robust.Shared.Map.Enumerators;
+
+/// <summary>
+/// Iterates chunk indices but prefers ones closer towards the center first.
+/// </summary>
+public record struct NearestChunkEnumerator
+{
+    private readonly Vector2i _chunkLB;
+    private readonly Vector2i _chunkRT;
+
+    private ValueList<Vector2i> _chunks = new();
+
+    private int _n;
+
+    public NearestChunkEnumerator(Box2 localAABB, int chunkSize)
+    {
+        _chunkLB = (localAABB.BottomLeft / chunkSize).Floored();
+        _chunkRT = (localAABB.TopRight / chunkSize).Floored();
+        InitializeChunks(new Vector2i(chunkSize, chunkSize));
+    }
+
+    public NearestChunkEnumerator(Box2 localAABB, Vector2i chunkSize)
+    {
+        _chunkLB = (localAABB.BottomLeft / chunkSize).Floored();
+        _chunkRT = (localAABB.TopRight / chunkSize).Floored();
+        InitializeChunks(chunkSize);
+    }
+
+    private void InitializeChunks(Vector2i chunkSize)
+    {
+        var bl = (Vector2)_chunkLB * chunkSize;
+        var tr = (Vector2)_chunkRT * chunkSize;
+        var halfChunk = new Vector2(chunkSize.X / 2f, chunkSize.Y / 2f);
+
+        var center = (tr - bl) / 2 + bl;
+
+        for (var x = _chunkLB.X; x < _chunkRT.X; x++)
+        {
+            for (var y = _chunkLB.Y; y < _chunkRT.Y; y++)
+            {
+                _chunks.Add(new Vector2i(x, y) * chunkSize);
+            }
+        }
+
+        _chunks.Sort((c1, c2) => ((c1 + halfChunk) - center).LengthSquared().CompareTo(((c2 + halfChunk) - center).LengthSquared()));
+    }
+
+    public bool MoveNext([NotNullWhen(true)] out Vector2i? indices)
+    {
+        if (_n >= _chunks.Count)
+        {
+            indices = null;
+            return false;
+        }
+
+        indices = _chunks[_n++] ;
+        return true;
+    }
+}

Robust.Shared/Map/ITileDefinition.cs

@@ -20,11 +20,6 @@ namespace Robust.Shared.Map
         /// </summary>
         string Name { get; }
 
-        /// <summary>
-        ///     Internal name of the definition.
-        /// </summary>
-        string ID { get; }
-
         /// <summary>
         ///     The path of the sprite to draw.
         /// </summary>

Robust.Shared/Noise/FastNoiseLite.cs

@@ -37,7 +37,7 @@ using FNLfloat = System.Single;
 //using FNLfloat = System.Double;
 
 [DataDefinition, Serializable, NetSerializable]
-public sealed partial class FastNoiseLite
+public sealed partial class FastNoiseLite : ISerializationHooks
 {
     private const short INLINE = 256; // MethodImplOptions.AggressiveInlining;
     private const short OPTIMISE = 512; // MethodImplOptions.AggressiveOptimization;
@@ -136,7 +136,6 @@ public sealed partial class FastNoiseLite
     [DataField("pingPongStrength")]
     private float mPingPongStrength = 2.0f;
 
-    [DataField("fractalBounding")]
     private float mFractalBounding = 1 / 1.75f;
 
     [DataField("cellularDistanceFunction")]
@@ -170,6 +169,11 @@ public sealed partial class FastNoiseLite
         SetSeed(1337);
     }
 
+    void ISerializationHooks.AfterDeserialization()
+    {
+        CalculateFractalBounding();
+    }
+
     public int GetSeed() => mSeed;
 
     /// <summary>

Robust.Shared/Physics/Components/Gravity2DComponent.cs

@@ -1,18 +0,0 @@
-using System.Numerics;
-using Robust.Shared.GameObjects;
-using Robust.Shared.GameStates;
-using Robust.Shared.Maths;
-using Robust.Shared.Serialization.Manager.Attributes;
-using Robust.Shared.ViewVariables;
-
-namespace Robust.Shared.Physics.Components;
-
-[RegisterComponent, NetworkedComponent]
-public sealed partial class Gravity2DComponent : Component
-{
-    /// <summary>
-    /// Applies side-view gravity to the map.
-    /// </summary>
-    [ViewVariables(VVAccess.ReadWrite), DataField("gravity")]
-    public Vector2 Gravity;
-}

Robust.Shared/Physics/Components/PhysicsComponent.Physics.cs

@@ -154,11 +154,6 @@ public sealed partial class PhysicsComponent : Component, IComponentDelta
     // ReSharper disable once InconsistentNaming
     internal float _inertia;
 
-    /// <summary>
-    ///     Indicates whether this body ignores gravity
-    /// </summary>
-    [ViewVariables(VVAccess.ReadWrite)] public bool IgnoreGravity;
-
     /// <summary>
     /// Inverse moment of inertia (1 / I).
     /// </summary>
@@ -264,6 +259,9 @@ public sealed partial class PhysicsComponent : Component, IComponentDelta
     [DataField, Access(typeof(SharedPhysicsSystem), Friend = AccessPermissions.ReadWriteExecute, Other = AccessPermissions.Read)]
     public BodyStatus BodyStatus { get; set; }
 
+    [DataField, Access(typeof(SharedPhysicsSystem))]
+    public bool IgnoreGravity;
+
     [ViewVariables, Access(typeof(SharedPhysicsSystem))]
     public bool Predict;
 }