Version: 219.2.2

(cherry picked from commit 025d90d281)
(cherry picked from commit 799702b814)
(cherry picked from commit 4600ee8e5788891f1b610e2d5141fb4e1228d323)

.github/workflows/build-test.yml

@@ -27,7 +27,8 @@ jobs:
       run: dotnet restore
     - name: Build
       run: dotnet build --no-restore /p:WarningsAsErrors=nullable
-    - name: Test Engine
+    - name: Robust.UnitTesting
       run: dotnet test --no-build Robust.UnitTesting/Robust.UnitTesting.csproj -- NUnit.ConsoleOut=0
-
+    - name: Robust.Analyzers.Tests
+      run: dotnet test --no-build Robust.Analyzers.Tests/Robust.Analyzers.Tests.csproj -- NUnit.ConsoleOut=0
 

.github/workflows/publish-client.yml

@@ -33,10 +33,10 @@ jobs:
         mkdir "release/${{ steps.parse_version.outputs.version }}"
         mv release/*.zip "release/${{ steps.parse_version.outputs.version }}"
 
-    - name: Upload files to centcomm
+    - name: Upload files to Suns
       uses: appleboy/scp-action@master
       with:
-        host: centcomm.spacestation14.io
+        host: suns.spacestation14.com
         username: robust-build-push
         key: ${{ secrets.CENTCOMM_ROBUST_BUILDS_PUSH_KEY }}
         source: "release/${{ steps.parse_version.outputs.version }}"
@@ -46,7 +46,7 @@ jobs:
     - name: Update manifest JSON
       uses: appleboy/ssh-action@master
       with:
-        host: centcomm.spacestation14.io
+        host: suns.spacestation14.com
         username: robust-build-push
         key: ${{ secrets.CENTCOMM_ROBUST_BUILDS_PUSH_KEY }}
         script: /home/robust-build-push/push.ps1 ${{ steps.parse_version.outputs.version }}

Directory.Packages.props

@@ -1,4 +1,14 @@
 <Project>
+  <PropertyGroup>
+    <!--
+    We actually set ManagePackageVersionsCentrally manually in another import file.
+    Since .NET SDK 8.0.300, ManagePackageVersionsCentrally is automatically set if Directory.Packages.props exists.
+    https://github.com/NuGet/NuGet.Client/pull/5572
+    We actively negate this here, as we have some packages in tree we don't want such automatic behavior for.
+    We use Directory.Build.props to get copy the state *after* our MSBuild config but before Nuget's config.
+    -->
+    <ManagePackageVersionsCentrally />
+  </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="BenchmarkDotNet" Version="0.13.12" />
     <PackageVersion Include="DiscordRichPresence" Version="1.2.1.24" />
@@ -45,7 +55,7 @@
     <PackageVersion Include="Serilog" Version="3.1.1" />
     <PackageVersion Include="Serilog.Sinks.Loki" Version="4.0.0-beta3" />
     <PackageVersion Include="SharpZstd.Interop" Version="1.5.2-beta2" />
-    <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.3" />
+    <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.5" />
     <PackageVersion Include="SpaceWizards.HttpListener" Version="0.1.0" />
     <PackageVersion Include="SpaceWizards.NFluidsynth" Version="0.1.1" />
     <PackageVersion Include="SpaceWizards.SharpFont" Version="1.0.2" />

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

@@ -1,4 +1,4 @@
-# Release notes for RobustToolbox.
+# Release notes for RobustToolbox.
 
 <!--
 NOTE: automatically updated sometimes by version.py.
@@ -54,6 +54,207 @@ END TEMPLATE-->
 *None yet*
 
 
+## 219.2.2
+
+
+## 219.2.1
+
+
+## 219.2.0
+
+### New features
+
+* Add SetMapCoordinates to TransformSystem.
+* Improve YAML Linter and validation of static fields.
+
+### Bugfixes
+
+* Fix DebugCoordsPanel freezing when hovering a control.
+
+### Other
+
+* Optimise physics networking to not dirty every tick of movement.
+
+
+## 219.1.3
+
+### Bugfixes
+
+* Fix map-loader not pausing pre-init maps when not actively overwriting an existing map.
+
+
+## 219.1.2
+
+### Bugfixes
+
+* Fix map-loader not map-initialising grids when loading into a post-init map.
+
+
+## 219.1.1
+
+### Bugfixes
+
+* Fix map-loader not map-initialising maps when overwriting a post-init map.
+
+
+## 219.1.0
+
+### New features
+
+* Added a new optional arguments to various entity spawning methods, including a new argument to set the entity's rotation.
+
+### Bugfixes
+
+* Fixes map initialisation not always initialising all entities on a map.
+
+### Other
+
+* The default value of the `auth.mode` cvar has changed
+
+
+## 219.0.0
+
+### Breaking changes
+
+* Move most IMapManager functionality to SharedMapSystem.
+
+
+## 218.2.0
+
+### New features
+
+* Control layout properties such as `Margin` can now be set via style sheets.
+* Expose worldposition in SpriteComponent.Render
+* Network audio entity Play/Pause/Stop states and playback position.
+* Add `Disabled` functionality to `Slider` control.
+
+
+## 218.1.0
+
+### New features
+
+* Add IEquatable.Equals to the sandbox.
+* Enable roslyn extensions tests in CI.
+* Add a VerticalTabContainer control to match the horizontal one.
+
+### Bugfixes
+
+* Fix divison remainder issue for Colors, fixing purples.
+
+### Other
+
+* Default hub address (`hub.hub_urls`) has been changed to `https://hub.spacestation14.com/`.
+
+
+## 218.0.0
+
+### Breaking changes
+
+* `Robust.Shared.Configuration.EnvironmentVariables` is now internal and no longer usable by content.
+
+### New features
+
+* Add TryGetRandom to EntityManager to get a random entity with the specified component and TryGetRandom to IPrototypeManager to return a random prototype of the specified type.
+* Add CopyData to AppearanceSystem.
+* Update UI themes on prototype reloads.
+* Allow scaling the line height of a RichTextLabel.
+* You can now specify CVar overrides via environment variable with the `ROBUST_CVAR_*` prefix. For example `ROBUST_CVAR_game__hostname=foobar` would set the appropriate CVar. Double underscores in the environment variable name are replaced with ".".
+* Added non-generic variant of `GetCVar` to `IConfigurationManager`.
+* Add type tracking to FieldNotFoundErrorNode for serialization.
+* Distance between lines of a `RichTextLabel` can now be modified with `LineHeightScale`.
+* UI theme prototypes are now updated when reloaded.
+* New `RA0025` analyzer diagnostic warns for manual assignment to `[Dependency]` fields.
+
+### Bugfixes
+
+* Request headers in `IStatusHandlerContext` are now case-insensitive.
+* SetWorldPosition rotation now more closely aligns with prior behavior.
+* Fix exception when inspecting elements in some cases.
+* Fix HTTP errors on watchdog ping not being reported.
+
+### Other
+
+* Add an analyzer for redundantly assigning to dependency fields.
+
+### Internal
+
+* Remove redundant Exists checks in ContainerSystem.
+* Improve logging on watchdog pings.
+
+
+## 217.2.1
+
+### Bugfixes
+
+* Fix LineEdit tests on engine.
+
+### Internal
+
+* Make various ValueList enumerators access the span directly for performance.
+
+
+## 217.2.0
+
+### New features
+
+* Added `AddComponents` and `RemoveComponents` methods to EntityManager that handle EntityPrototype / ComponentRegistry bulk component changes.
+* Add double-clicking to LineEdit.
+
+### Bugfixes
+
+* Properly ignore non-hard fixtures for IntersectRayWithPredicate.
+* Fix nullable TimeSpan addition on some platforms.
+
+
+## 217.1.0
+
+### New features
+
+* Added `IRobustRandom.GetItems` extension methods for randomly picking multiple items from a collections.
+* Added `SharedPhysicsSystem.EffectiveCurTime`. This is effectively a variation of `IGameTiming.CurTime` that takes into account the current physics sub-step.
+
+### Bugfixes
+
+* Fix `MapComponent.LightingEnabled` not leaving FOV rendering in a broken state.
+
+### Internal
+
+* `Shuffle<T>(Span<T>, System.Random)` has been removed, just use the builtin method.
+
+
+## 217.0.0
+
+### Breaking changes
+
+* TransformSystem.SetWorldPosition and SetWorldPositionRotation will now also perform parent updates as necessary. Previously it would just set the entity's LocalPosition which may break if they were inside of a container. Now they will be removed from their container and TryFindGridAt will run to correctly parent them to the new position. If the old functionality is desired then you can use GetInvWorldMatrix to update the LocalPosition (bearing in mind containers may prevent this).
+
+### New features
+
+* Implement VV for AudioParams on SoundSpecifiers.
+* Add AddUi to the shared UI system.
+
+### Bugfixes
+
+* Fix the first measure of ScrollContainer bars.
+
+
+## 216.0.0
+
+### Breaking changes
+
+* The `net.low_lod_distance` cvar has been replaced with a new `net.pvs_priority_range`. Instead of limiting the range at which all entities are sent to a player, it now extends the range at which high priorities can be sent. The default value of this new cvar is 32.5, which is larger than the default `net.pvs_range` value of 25.
+
+### New features
+
+* You can now specify a component to not be saved to map files with `[UnsavedComponent]`.
+* Added `ITileDefinitionManager.TryGetDefinition`.
+* The map loader now tries to preserve the `tilemap` contents of map files, which should reduce diffs when re-saving a map after the game's internal tile IDs have changed.
+
+### Bugfixes
+
+* Fix buffered audio sources not being disposed.
+
+
 ## 215.3.1
 
 ### Bugfixes

Resources/Locale/en-US/view-variables.ftl

@@ -10,3 +10,18 @@ view-variable-instance-entity-client-components-search-bar-placeholder = Search
 view-variable-instance-entity-server-components-search-bar-placeholder = Search
 view-variable-instance-entity-add-window-server-components = Add Component [S]
 view-variable-instance-entity-add-window-client-components = Add Component [C]
+
+
+## SoundSpecifier
+vv-sound-none = None
+vv-sound-path = Path
+vv-sound-collection = Collection
+
+vv-sound-volume = volume
+vv-sound-pitch = Pitch
+vv-sound-max-distance = Max Distance
+vv-sound-rolloff-factor = Rolloff Factor
+vv-sound-reference-distance = Reference Distance
+vv-sound-loop = Loop
+vv-sound-play-offset = Play Offset (s)
+vv-sound-variation = Pitch variation

Resources/Locale/en-US/vv.ftl

@@ -1,3 +0,0 @@
-vv-sound-none = None
-vv-sound-path = Path
-vv-sound-collection = Collection

Robust.Analyzers.Tests/AccessAnalyzer_Test.cs

@@ -20,11 +20,16 @@ public sealed class AccessAnalyzer_Test
         {
             TestState =
             {
-                AdditionalReferences = { typeof(AccessAnalyzer).Assembly },
                 Sources = { code }
             },
         };
 
+        TestHelper.AddEmbeddedSources(
+            test.TestState,
+            "Robust.Shared.Analyzers.AccessAttribute.cs",
+            "Robust.Shared.Analyzers.AccessPermissions.cs"
+        );
+
         // ExpectedDiagnostics cannot be set, so we need to AddRange here...
         test.TestState.ExpectedDiagnostics.AddRange(expected);
 

Robust.Analyzers.Tests/DependencyAssignAnalyzerTest.cs

@@ -0,0 +1,58 @@
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.CSharp.Testing;
+using Microsoft.CodeAnalysis.Testing;
+using Microsoft.CodeAnalysis.Testing.Verifiers;
+using NUnit.Framework;
+using VerifyCS =
+    Microsoft.CodeAnalysis.CSharp.Testing.NUnit.AnalyzerVerifier<Robust.Analyzers.DependencyAssignAnalyzer>;
+
+namespace Robust.Analyzers.Tests;
+
+[Parallelizable(ParallelScope.All | ParallelScope.Fixtures)]
+[TestFixture]
+public sealed class DependencyAssignAnalyzerTest
+{
+    private static Task Verifier(string code, params DiagnosticResult[] expected)
+    {
+        var test = new CSharpAnalyzerTest<DependencyAssignAnalyzer, NUnitVerifier>()
+        {
+            TestState =
+            {
+                Sources = { code }
+            },
+        };
+
+        TestHelper.AddEmbeddedSources(
+            test.TestState,
+            "Robust.Shared.IoC.DependencyAttribute.cs"
+        );
+
+        // ExpectedDiagnostics cannot be set, so we need to AddRange here...
+        test.TestState.ExpectedDiagnostics.AddRange(expected);
+
+        return test.RunAsync();
+    }
+
+    [Test]
+    public async Task Test()
+    {
+        const string code = """
+            using Robust.Shared.IoC;
+
+            public sealed class Foo
+            {
+                [Dependency]
+                private object? Field;
+
+                public Foo()
+                {
+                    Field = "A";
+                }
+            }
+            """;
+
+        await Verifier(code,
+            // /0/Test0.cs(10,9): warning RA0025: Tried to assign to [Dependency] field 'Field'. Remove [Dependency] or inject it via field injection instead.
+            VerifyCS.Diagnostic().WithSpan(10, 9, 10, 20).WithArguments("Field"));
+    }
+}

Robust.Analyzers.Tests/Robust.Analyzers.Tests.csproj

@@ -6,6 +6,13 @@
   <Import Project="..\MSBuild\Robust.Properties.targets"/>
   <Import Project="..\MSBuild\Robust.Engine.props"/>
 
+  <!-- Engine source files needed to make the tests work -->
+  <ItemGroup>
+    <EmbeddedResource Include="..\Robust.Shared\Analyzers\AccessAttribute.cs" LogicalName="Robust.Shared.Analyzers.AccessAttribute.cs" LinkBase="Implementations" />
+    <EmbeddedResource Include="..\Robust.Shared\Analyzers\AccessPermissions.cs" LogicalName="Robust.Shared.Analyzers.AccessPermissions.cs" LinkBase="Implementations" />
+    <EmbeddedResource Include="..\Robust.Shared\IoC\DependencyAttribute.cs" LogicalName="Robust.Shared.IoC.DependencyAttribute.cs" LinkBase="Implementations" />
+  </ItemGroup>
+
   <PropertyGroup>
     <IsPackable>false</IsPackable>
   </PropertyGroup>

Robust.Analyzers.Tests/TestHelper.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+using Microsoft.CodeAnalysis.Testing;
+using Microsoft.CodeAnalysis.Text;
+
+namespace Robust.Analyzers.Tests;
+
+public static class TestHelper
+{
+    public static void AddEmbeddedSources(SolutionState state, params string[] embeddedFiles)
+    {
+        AddEmbeddedSources(state, (IEnumerable<string>) embeddedFiles);
+    }
+
+    public static void AddEmbeddedSources(SolutionState state, IEnumerable<string> embeddedFiles)
+    {
+        foreach (var fileName in embeddedFiles)
+        {
+            using var stream = typeof(AccessAnalyzer_Test).Assembly.GetManifestResourceStream(fileName)!;
+            state.Sources.Add((fileName, SourceText.From(stream)));
+        }
+    }
+}

Robust.Analyzers/DependencyAssignAnalyzer.cs

@@ -0,0 +1,61 @@
+using System.Collections.Immutable;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Diagnostics;
+using Microsoft.CodeAnalysis.Operations;
+using Robust.Roslyn.Shared;
+
+namespace Robust.Analyzers;
+
+[DiagnosticAnalyzer(LanguageNames.CSharp)]
+public sealed class DependencyAssignAnalyzer : DiagnosticAnalyzer
+{
+    private const string DependencyAttributeType = "Robust.Shared.IoC.DependencyAttribute";
+
+    private static readonly DiagnosticDescriptor Rule = new (
+        Diagnostics.IdDependencyFieldAssigned,
+        "Assignment to dependency field",
+        "Tried to assign to [Dependency] field '{0}'. Remove [Dependency] or inject it via field injection instead.",
+        "Usage",
+        DiagnosticSeverity.Warning,
+        true);
+
+    public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => ImmutableArray.Create(Rule);
+
+    public override void Initialize(AnalysisContext context)
+    {
+        context.EnableConcurrentExecution();
+        context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+        context.RegisterOperationAction(CheckAssignment, OperationKind.SimpleAssignment);
+    }
+
+    private static void CheckAssignment(OperationAnalysisContext context)
+    {
+        if (context.Operation is not ISimpleAssignmentOperation assignment)
+            return;
+
+        if (assignment.Target is not IFieldReferenceOperation fieldRef)
+            return;
+
+        var field = fieldRef.Field;
+        var attributes = field.GetAttributes();
+        if (attributes.Length == 0)
+            return;
+
+        var depAttribute = context.Compilation.GetTypeByMetadataName(DependencyAttributeType);
+        if (!HasAttribute(attributes, depAttribute))
+            return;
+
+        context.ReportDiagnostic(Diagnostic.Create(Rule, assignment.Syntax.GetLocation(), field.Name));
+    }
+
+    private static bool HasAttribute(ImmutableArray<AttributeData> attributes, ISymbol symbol)
+    {
+        foreach (var attribute in attributes)
+        {
+            if (SymbolEqualityComparer.Default.Equals(attribute.AttributeClass, symbol))
+                return true;
+        }
+
+        return false;
+    }
+}

Robust.Analyzers/Robust.Analyzers.csproj

@@ -2,24 +2,29 @@
 
   <ItemGroup>
     <!-- Needed for NotNullableFlagAnalyzer. -->
-    <Compile Include="..\Robust.Shared\Analyzers\NotNullableFlagAttribute.cs" />
+    <Compile Include="..\Robust.Shared\Analyzers\NotNullableFlagAttribute.cs" LinkBase="Implementations" />
   </ItemGroup>
 
   <ItemGroup>
     <!-- Needed for FriendAnalyzer. -->
-    <Compile Include="..\Robust.Shared\Analyzers\AccessAttribute.cs" />
-    <Compile Include="..\Robust.Shared\Analyzers\AccessPermissions.cs" />
+    <Compile Include="..\Robust.Shared\Analyzers\AccessAttribute.cs" LinkBase="Implementations" />
+    <Compile Include="..\Robust.Shared\Analyzers\AccessPermissions.cs" LinkBase="Implementations" />
   </ItemGroup>
 
   <ItemGroup>
     <!-- Needed for PreferGenericVariantAnalyzer. -->
-    <Compile Include="..\Robust.Shared\Analyzers\PreferGenericVariantAttribute.cs" />
+    <Compile Include="..\Robust.Shared\Analyzers\PreferGenericVariantAttribute.cs" LinkBase="Implementations" />
   </ItemGroup>
 
   <Import Project="../Robust.Roslyn.Shared/Robust.Roslyn.Shared.props" />
 
   <PropertyGroup>
     <Nullable>disable</Nullable>
+    <!--
+    Rider seems to get really confused with hot reload if we directly compile in the above-linked classes.
+    As such, they have an #if to change their namespace in this project.
+    -->
+    <DefineConstants>$(DefineConstants);ROBUST_ANALYZERS_IMPL</DefineConstants>
   </PropertyGroup>
 
 </Project>

Robust.Benchmarks/Collections/ValueListEnumerationBenchmarks.cs

@@ -0,0 +1,83 @@
+using System;
+using System.Collections.Generic;
+using BenchmarkDotNet.Attributes;
+using Robust.Shared.Analyzers;
+using Robust.Shared.Collections;
+
+namespace Robust.Benchmarks.Collections;
+
+[Virtual]
+public class ValueListEnumerationBenchmarks
+{
+    [Params(4, 16, 64)]
+    public int N { get; set; }
+
+    private sealed class Data(int i)
+    {
+        public readonly int I = i;
+    }
+
+    private ValueList<Data> _valueList;
+    private Data[] _array = default!;
+
+    [GlobalSetup]
+    public void Setup()
+    {
+        var list = new List<Data>(N);
+        for (var i = 0; i < N; i++)
+        {
+            list.Add(new(i));
+        }
+
+        _array = list.ToArray();
+        _valueList = new(list.ToArray());
+    }
+
+    [Benchmark]
+    public int ValueList()
+    {
+        var total = 0;
+        foreach (var ev in _valueList)
+        {
+            total += ev.I;
+        }
+
+        return total;
+    }
+
+    [Benchmark]
+    public int ValueListSpan()
+    {
+        var total = 0;
+        foreach (var ev in _valueList.Span)
+        {
+            total += ev.I;
+        }
+
+        return total;
+    }
+
+    [Benchmark]
+    public int Array()
+    {
+        var total = 0;
+        foreach (var ev in _array)
+        {
+            total += ev.I;
+        }
+
+        return total;
+    }
+
+    [Benchmark]
+    public int Span()
+    {
+        var total = 0;
+        foreach (var ev in _array.AsSpan())
+        {
+            total += ev.I;
+        }
+
+        return total;
+    }
+}

Robust.Benchmarks/EntityManager/AddRemoveComponentBenchmark.cs

@@ -26,9 +26,8 @@ public partial class AddRemoveComponentBenchmark
             .InitializeInstance();
 
         _entityManager = _simulation.Resolve<IEntityManager>();
-
-        var coords = new MapCoordinates(0, 0, new MapId(1));
-        _simulation.AddMap(coords.MapId);
+        var map = _simulation.CreateMap().Uid;
+        var coords = new EntityCoordinates(map, default);
 
         for (var i = 0; i < N; i++)
         {

Robust.Benchmarks/EntityManager/ComponentIteratorBenchmark.cs

@@ -29,8 +29,8 @@ public partial class ComponentIteratorBenchmark
 
         Comps = new A[N+2];
 
-        var coords = new MapCoordinates(0, 0, new MapId(1));
-        _simulation.AddMap(coords.MapId);
+        var map = _simulation.CreateMap().MapId;
+        var coords = new MapCoordinates(default, map);
 
         for (var i = 0; i < N; i++)
         {

Robust.Benchmarks/EntityManager/GetComponentBenchmark.cs

@@ -31,8 +31,8 @@ public partial class GetComponentBenchmark
 
         Comps = new A[N+2];
 
-        var coords = new MapCoordinates(0, 0, new MapId(1));
-        _simulation.AddMap(coords.MapId);
+        var map = _simulation.CreateMap().Uid;
+        var coords = new EntityCoordinates(map, default);
 
         for (var i = 0; i < N; i++)
         {

Robust.Benchmarks/EntityManager/SpawnDeleteEntityBenchmark.cs

@@ -29,10 +29,9 @@ public partial class SpawnDeleteEntityBenchmark
             .InitializeInstance();
 
         _entityManager = _simulation.Resolve<IEntityManager>();
-
-        _mapCoords = new MapCoordinates(0, 0, new MapId(1));
-        var uid = _simulation.AddMap(_mapCoords.MapId);
-        _entCoords = new EntityCoordinates(uid, 0, 0);
+        var (map, mapId) = _simulation.CreateMap();
+        _mapCoords = new MapCoordinates(default, mapId);
+        _entCoords = new EntityCoordinates(map, 0, 0);
     }
 
     [Benchmark(Baseline = true)]

Robust.Benchmarks/Transform/RecursiveMoveBenchmark.cs

@@ -91,8 +91,7 @@ public class RecursiveMoveBenchmark : RobustIntegrationTest
         // Set up map and spawn player
         server.WaitPost(() =>
         {
-            var mapId = mapMan.CreateMap();
-            var map = mapMan.GetMapEntityId(mapId);
+            var map = server.ResolveDependency<SharedMapSystem>().CreateMap(out var mapId);
             var gridComp = mapMan.CreateGridEntity(mapId);
             var grid = gridComp.Owner;
             mapSys.SetTile(grid, gridComp, Vector2i.Zero, new Tile(1));

Robust.Client/Audio/AudioOverlay.cs

@@ -74,11 +74,13 @@ public sealed class AudioOverlay : Overlay
             output.Clear();
             output.AppendLine("Audio Source");
             output.AppendLine("Runtime:");
+            output.AppendLine($"- Distance: {_audio.GetAudioDistance(distance.Length()):0.00}");
             output.AppendLine($"- Occlusion: {posOcclusion:0.0000}");
             output.AppendLine("Params:");
+            output.AppendLine($"- RolloffFactor: {comp.RolloffFactor:0.0000}");
             output.AppendLine($"- Volume: {comp.Volume:0.0000}");
-            output.AppendLine($"- Reference distance: {comp.ReferenceDistance}");
-            output.AppendLine($"- Max distance: {comp.MaxDistance}");
+            output.AppendLine($"- Reference distance: {comp.ReferenceDistance:0.00}");
+            output.AppendLine($"- Max distance: {comp.MaxDistance:0.00}");
             var outputText = output.ToString().Trim();
             var dimensions = screenHandle.GetDimensions(_font, outputText, 1f);
             var buffer = new Vector2(3f, 3f);

Robust.Client/Audio/AudioSystem.cs

@@ -126,6 +126,33 @@ public sealed partial class AudioSystem : SharedAudioSystem
         {
             component.Source.SetAuxiliary(null);
         }
+
+        switch (component.State)
+        {
+            case AudioState.Playing:
+                component.StartPlaying();
+                break;
+            case AudioState.Paused:
+                component.Pause();
+                break;
+            case AudioState.Stopped:
+                component.StopPlaying();
+                component.PlaybackPosition = 0f;
+                break;
+        }
+
+        // If playback position changed then update it.
+        if (!string.IsNullOrEmpty(component.FileName))
+        {
+            var position = (float) ((component.PauseTime ?? Timing.CurTime) - component.AudioStart).TotalSeconds;
+            var currentPosition = component.Source.PlaybackPosition;
+            var diff = Math.Abs(position - currentPosition);
+
+            if (diff > 0.1f)
+            {
+                component.PlaybackPosition = position;
+            }
+        }
     }
 
     /// <summary>
@@ -361,7 +388,7 @@ public sealed partial class AudioSystem : SharedAudioSystem
         var distance = delta.Length();
 
         // Out of range so just clip it for us.
-        if (distance > component.MaxDistance)
+        if (GetAudioDistance(distance) > component.MaxDistance)
         {
             // Still keeps the source playing, just with no volume.
             component.Gain = 0f;

Robust.Client/Audio/Sources/BaseAudioSource.cs

@@ -314,6 +314,8 @@ public abstract class BaseAudioSource : IAudioSource
         set
         {
             _checkDisposed();
+
+            value = MathF.Max(value, 0f);
             AL.Source(SourceHandle, ALSourcef.SecOffset, value);
             Master._checkAlError($"Tried to set invalid playback position of {value:0.00}");
         }

Robust.Client/BaseClient.cs

@@ -285,6 +285,7 @@ namespace Robust.Client
     /// <summary>
     ///     Enumeration of the run levels of the BaseClient.
     /// </summary>
+    /// <seealso cref="ClientRunLevelExt"/>
     public enum ClientRunLevel : byte
     {
         Error = 0,
@@ -315,6 +316,21 @@ namespace Robust.Client
         SinglePlayerGame,
     }
 
+    /// <summary>
+    /// Helper functions for working with <see cref="ClientRunLevel"/>.
+    /// </summary>
+    public static class ClientRunLevelExt
+    {
+        /// <summary>
+        /// Check if a <see cref="ClientRunLevel"/> is <see cref="ClientRunLevel.InGame"/>
+        /// or <see cref="ClientRunLevel.SinglePlayerGame"/>.
+        /// </summary>
+        public static bool IsInGameLike(this ClientRunLevel runLevel)
+        {
+            return runLevel is ClientRunLevel.InGame or ClientRunLevel.SinglePlayerGame;
+        }
+    }
+
     /// <summary>
     ///     Event arguments for when something changed with the player.
     /// </summary>

Robust.Client/Console/Commands/DumpMetadataMembersCommand.cs

@@ -11,7 +11,7 @@ namespace Robust.Client.Console.Commands
 
         public override void Execute(IConsoleShell shell, string argStr, string[] args)
         {
-            var type = Type.GetType(args[0]);
+            var type = GetType(args[0]);
 
             if (type == null)
             {
@@ -25,6 +25,17 @@ namespace Robust.Client.Console.Commands
                 shell.WriteLine(sig);
             }
         }
+
+        private Type? GetType(string name)
+        {
+            foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
+            {
+                if (assembly.GetType(name) is { } type)
+                    return type;
+            }
+
+            return null;
+        }
     }
 #endif
 }

Robust.Client/GameController/GameController.cs

@@ -612,6 +612,8 @@ namespace Robust.Client
             {
                 _modLoader.BroadcastUpdate(ModUpdateLevel.FramePostEngine, frameEventArgs);
             }
+
+            _audio.FlushALDisposeQueues();
         }
 
         internal static void SetupLogging(

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

@@ -8,11 +8,9 @@ using System.Text;
 using Robust.Client.Graphics;
 using Robust.Client.ResourceManagement;
 using Robust.Client.Utility;
-using Robust.Shared;
 using Robust.Shared.Animations;
 using Robust.Shared.ComponentTrees;
 using Robust.Shared.GameObjects;
-using Robust.Shared.Graphics;
 using Robust.Shared.Graphics.RSI;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
@@ -1237,9 +1235,9 @@ namespace Robust.Client.GameObjects
         public IEnumerable<ISpriteLayer> AllLayers => Layers;
 
         // Lobby SpriteView rendering path
-        public void Render(DrawingHandleWorld drawingHandle, Angle eyeRotation, Angle worldRotation, Direction? overrideDirection = null)
+        public void Render(DrawingHandleWorld drawingHandle, Angle eyeRotation, Angle worldRotation, Direction? overrideDirection = null, Vector2 position = default)
         {
-            RenderInternal(drawingHandle, eyeRotation, worldRotation, Vector2.Zero, overrideDirection);
+            RenderInternal(drawingHandle, eyeRotation, worldRotation, position, overrideDirection);
         }
 
         [DataField("noRot")] private bool _screenLock = false;

Robust.Client/GameObjects/EntitySystems/ContainerSystem.cs

@@ -107,7 +107,7 @@ namespace Robust.Client.GameObjects
                 toDelete.Add(id);
             }
 
-            foreach (var dead in toDelete)
+            foreach (var dead in toDelete.Span)
             {
                 component.Containers.Remove(dead);
             }
@@ -142,7 +142,7 @@ namespace Robust.Client.GameObjects
                         toRemove.Add(entity);
                 }
 
-                foreach (var entity in toRemove)
+                foreach (var entity in toRemove.Span)
                 {
                     Remove(
                         (entity, TransformQuery.GetComponent(entity), MetaQuery.GetComponent(entity)),
@@ -162,7 +162,7 @@ namespace Robust.Client.GameObjects
                         removedExpected.Add(netEntity);
                 }
 
-                foreach (var entityUid in removedExpected)
+                foreach (var entityUid in removedExpected.Span)
                 {
                     RemoveExpectedEntity(entityUid, out _);
                 }

Robust.Client/GameObjects/EntitySystems/MapSystem.cs

@@ -1,12 +1,9 @@
 using Robust.Client.Graphics;
 using Robust.Client.Map;
-using Robust.Client.Physics;
 using Robust.Client.ResourceManagement;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Map;
-using Robust.Shared.Map.Components;
-using Robust.Shared.Physics.Dynamics;
 
 namespace Robust.Client.GameObjects;
 
@@ -16,6 +13,17 @@ public sealed class MapSystem : SharedMapSystem
     [Dependency] private readonly IResourceCache _resource = default!;
     [Dependency] private readonly ITileDefinitionManager _tileDefinitionManager = default!;
 
+    protected override MapId GetNextMapId()
+    {
+        // Client-side map entities use negative map Ids to avoid conflict with server-side maps.
+        var id = new MapId(--LastMapId);
+        while (MapManager.MapExists(id))
+        {
+            id = new MapId(--LastMapId);
+        }
+        return id;
+    }
+
     public override void Initialize()
     {
         base.Initialize();
@@ -27,9 +35,4 @@ public sealed class MapSystem : SharedMapSystem
         base.Shutdown();
         _overlayManager.RemoveOverlay<TileEdgeOverlay>();
     }
-
-    protected override void OnMapAdd(EntityUid uid, MapComponent component, ComponentAdd args)
-    {
-        EnsureComp<PhysicsMapComponent>(uid);
-    }
 }

Robust.Client/GameStates/ClientGameStateManager.cs

@@ -1138,7 +1138,7 @@ namespace Robust.Client.GameStates
                     if ((meta.Flags & MetaDataFlags.InContainer) != 0 &&
                         metas.TryGetComponent(xform.ParentUid, out var containerMeta) &&
                         (containerMeta.Flags & MetaDataFlags.Detached) == 0 &&
-                        containerSys.TryGetContainingContainer(xform.ParentUid, ent.Value, out container, null, true))
+                        containerSys.TryGetContainingContainer(xform.ParentUid, ent.Value, out container))
                     {
                         containerSys.Remove((ent.Value, xform, meta), container, false, true);
                     }
@@ -1329,23 +1329,8 @@ namespace Robust.Client.GameStates
 
             foreach (var (comp, cur, next) in _compStateWork.Values)
             {
-                try
-                {
-                    var handleState = new ComponentHandleState(cur, next);
-                    bus.RaiseComponentEvent(comp, ref handleState);
-                }
-#pragma warning disable CS0168 // Variable is declared but never used
-                catch (Exception e)
-#pragma warning restore CS0168 // Variable is declared but never used
-                {
-#if EXCEPTION_TOLERANCE
-                    _sawmill.Error($"Failed to apply comp state: entity={_entities.ToPrettyString(uid)}, comp={comp.GetType()}");
-                    _runtimeLog.LogException(e, $"{nameof(ClientGameStateManager)}.{nameof(HandleEntityState)}");
-#else
-                    _sawmill.Error($"Failed to apply comp state: entity={_entities.ToPrettyString(uid)}, comp={comp.GetType()}");
-                    throw;
-#endif
-                }
+                var handleState = new ComponentHandleState(cur, next);
+                bus.RaiseComponentEvent(comp, ref handleState);
             }
         }
 
@@ -1414,7 +1399,7 @@ namespace Robust.Client.GameStates
                     _entities.TryGetComponent(xform.ParentUid, out MetaDataComponent? containerMeta) &&
                     (containerMeta.Flags & MetaDataFlags.Detached) == 0)
                 {
-                    containerSys.TryGetContainingContainer(xform.ParentUid, uid, out container, null, true);
+                    containerSys.TryGetContainingContainer(xform.ParentUid, uid, out container);
                 }
 
                 _entities.EntitySysManager.GetEntitySystem<TransformSystem>().DetachParentToNull(uid, xform);

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

@@ -124,7 +124,7 @@ namespace Robust.Client.Graphics.Clyde
         {
             foreach (var (grid, chunks) in _mapChunkData)
             {
-                var gridComp = _mapManager.GetGridComp(grid);
+                var gridComp = _entityManager.GetComponent<MapGridComponent>(grid);
                 foreach (var (index, chunk) in chunks)
                 {
                     if (!chunk.Dirty || gridComp.Chunks.ContainsKey(index))

Robust.Client/Graphics/Clyde/Clyde.HLR.cs

@@ -11,6 +11,7 @@ using Robust.Shared;
 using Robust.Shared.Enums;
 using Robust.Shared.Graphics;
 using Robust.Shared.Map;
+using Robust.Shared.Map.Components;
 using Robust.Shared.Maths;
 using Robust.Shared.Profiling;
 using Robust.Shared.Utility;
@@ -250,10 +251,8 @@ namespace Robust.Client.Graphics.Clyde
         private void DrawEntities(Viewport viewport, Box2Rotated worldBounds, Box2 worldAABB, IEye eye)
         {
             var mapId = eye.Position.MapId;
-            if (mapId == MapId.Nullspace || !_mapManager.HasMapEntity(mapId))
-            {
+            if (mapId == MapId.Nullspace)
                 return;
-            }
 
             RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowEntities, worldAABB, worldBounds);
             var worldOverlays = GetOverlaysForSpace(OverlaySpace.WorldSpaceEntities);
@@ -514,7 +513,9 @@ namespace Robust.Client.Graphics.Clyde
 
                     if (_lightManager.Enabled && _lightManager.DrawHardFov && eye.DrawLight && eye.DrawFov)
                     {
-                        ApplyFovToBuffer(viewport, eye);
+                        var mapUid = _mapManager.GetMapEntityId(eye.Position.MapId);
+                        if (_entityManager.GetComponent<MapComponent>(mapUid).LightingEnabled)
+                            ApplyFovToBuffer(viewport, eye);
                     }
                 }
 

Robust.Client/Graphics/Shaders/ShaderPrototype.cs

@@ -17,7 +17,7 @@ using Vector4 = Robust.Shared.Maths.Vector4;
 namespace Robust.Client.Graphics
 {
     [Prototype("shader")]
-    public sealed class ShaderPrototype : IPrototype, ISerializationHooks
+    public sealed partial class ShaderPrototype : IPrototype, ISerializationHooks
     {
         [ViewVariables]
         [IdDataField]

Robust.Client/UserInterface/Control.Animations.cs

@@ -57,7 +57,7 @@ namespace Robust.Client.UserInterface
                 toRemove.Add(key);
             }
 
-            foreach (var key in toRemove)
+            foreach (var key in toRemove.Span)
             {
                 _playingAnimations.Remove(key);
                 AnimationCompleted?.Invoke(key);

Robust.Client/UserInterface/Control.Layout.Styling.cs

@@ -0,0 +1,132 @@
+using System;
+using System.Runtime.CompilerServices;
+
+namespace Robust.Client.UserInterface;
+
+public partial class Control
+{
+    private LayoutStyleProperties _layoutStyleOverride;
+    private LayoutStyleProperties _layoutStyleSheet;
+
+    private void UpdateLayoutStyleProperties()
+    {
+        var propertiesSet = LayoutStyleProperties.None;
+
+        // Assumed most controls will have little or no style properties,
+        // so iterating once is less expensive overall then checking 10+ properties.
+        // C# switch statements are compiled efficiently anyways.
+        foreach (var (key, value) in _styleProperties)
+        {
+            switch (key)
+            {
+                case nameof(SizeFlagsStretchRatio):
+                    UpdateField(ref _sizeFlagsStretchRatio, value, LayoutStyleProperties.StretchRatio);
+                    break;
+                case nameof(MinWidth):
+                    UpdateField(ref _minWidth, value, LayoutStyleProperties.MinWidth);
+                    break;
+                case nameof(MinHeight):
+                    UpdateField(ref _minHeight, value, LayoutStyleProperties.MinHeight);
+                    break;
+                case nameof(SetWidth):
+                    UpdateField(ref _setWidth, value, LayoutStyleProperties.SetWidth);
+                    break;
+                case nameof(SetHeight):
+                    UpdateField(ref _setHeight, value, LayoutStyleProperties.SetHeight);
+                    break;
+                case nameof(MaxWidth):
+                    UpdateField(ref _maxWidth, value, LayoutStyleProperties.MaxWidth);
+                    break;
+                case nameof(MaxHeight):
+                    UpdateField(ref _maxHeight, value, LayoutStyleProperties.MaxHeight);
+                    break;
+                case nameof(HorizontalExpand):
+                    UpdateField(ref _horizontalExpand, value, LayoutStyleProperties.HorizontalExpand);
+                    break;
+                case nameof(VerticalExpand):
+                    UpdateField(ref _verticalExpand, value, LayoutStyleProperties.VerticalExpand);
+                    break;
+                case nameof(HorizontalAlignment):
+                    UpdateField(ref _horizontalAlignment, value, LayoutStyleProperties.HorizontalAlignment);
+                    break;
+                case nameof(VerticalAlignment):
+                    UpdateField(ref _verticalAlignment, value, LayoutStyleProperties.VerticalAlignment);
+                    break;
+                case nameof(Margin):
+                    UpdateField(ref _margin, value, LayoutStyleProperties.Margin);
+                    break;
+            }
+        }
+
+        // Reset cleared properties back to defaults.
+        var toClear = _layoutStyleSheet & ~propertiesSet;
+        if (toClear != 0)
+        {
+            ClearField(ref _sizeFlagsStretchRatio, DefaultStretchRatio, LayoutStyleProperties.StretchRatio);
+            ClearField(ref _minWidth, 0, LayoutStyleProperties.MinWidth);
+            ClearField(ref _minHeight, 0, LayoutStyleProperties.MinHeight);
+            ClearField(ref _setWidth, DefaultSetSize, LayoutStyleProperties.SetWidth);
+            ClearField(ref _setHeight, DefaultSetSize, LayoutStyleProperties.SetHeight);
+            ClearField(ref _maxWidth, DefaultMaxSize, LayoutStyleProperties.MaxWidth);
+            ClearField(ref _maxHeight, DefaultMaxSize, LayoutStyleProperties.MaxHeight);
+            ClearField(ref _horizontalExpand, false, LayoutStyleProperties.HorizontalExpand);
+            ClearField(ref _verticalExpand, false, LayoutStyleProperties.VerticalExpand);
+            ClearField(ref _horizontalAlignment, DefaultHAlignment, LayoutStyleProperties.HorizontalAlignment);
+            ClearField(ref _verticalAlignment, DefaultVAlignment, LayoutStyleProperties.VerticalAlignment);
+            ClearField(ref _margin, default, LayoutStyleProperties.Margin);
+        }
+
+        _layoutStyleSheet = propertiesSet;
+
+        return;
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        void UpdateField<T>(ref T field, object value, LayoutStyleProperties flag)
+        {
+            if ((_layoutStyleOverride & flag) != 0)
+                return;
+
+            // TODO: Probably need better error handling...
+            if (value is not T valueCast)
+                return;
+
+            field = valueCast;
+            propertiesSet |= flag;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        void ClearField<T>(ref T field, T defaultValue, LayoutStyleProperties flag)
+        {
+            if ((toClear & flag) == 0)
+                return;
+
+            field = defaultValue;
+        }
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void SetLayoutStyleProp(LayoutStyleProperties flag)
+    {
+        _layoutStyleOverride |= flag;
+    }
+
+    [Flags]
+    private enum LayoutStyleProperties : short
+    {
+        // @formatter:off
+        None                = 0,
+        Margin              = 1 << 0,
+        MinWidth            = 1 << 1,
+        MinHeight           = 1 << 2,
+        SetWidth            = 1 << 3,
+        SetHeight           = 1 << 4,
+        MaxWidth            = 1 << 5,
+        MaxHeight           = 1 << 6,
+        StretchRatio        = 1 << 7,
+        HorizontalExpand    = 1 << 8,
+        VerticalExpand      = 1 << 9,
+        HorizontalAlignment = 1 << 10,
+        VerticalAlignment   = 1 << 11,
+        // @formatter:on
+    }
+}

Robust.Client/UserInterface/Control.Layout.cs

@@ -12,24 +12,30 @@ namespace Robust.Client.UserInterface
 
     public partial class Control
     {
+        private const float DefaultStretchRatio = 1;
+        private const float DefaultSetSize = float.NaN;
+        private const float DefaultMaxSize = float.PositiveInfinity;
+        private const HAlignment DefaultHAlignment = HAlignment.Stretch;
+        private const VAlignment DefaultVAlignment = VAlignment.Stretch;
+
         private Vector2 _size;
 
         [ViewVariables] internal Vector2? PreviousMeasure;
         [ViewVariables] internal UIBox2? PreviousArrange;
 
-        private float _sizeFlagsStretchRatio = 1;
+        private float _sizeFlagsStretchRatio = DefaultStretchRatio;
 
         private float _minWidth;
         private float _minHeight;
-        private float _setWidth = float.NaN;
-        private float _setHeight = float.NaN;
-        private float _maxWidth = float.PositiveInfinity;
-        private float _maxHeight = float.PositiveInfinity;
+        private float _setWidth = DefaultSetSize;
+        private float _setHeight = DefaultSetSize;
+        private float _maxWidth = DefaultMaxSize;
+        private float _maxHeight = DefaultMaxSize;
 
         private bool _horizontalExpand;
         private bool _verticalExpand;
-        private HAlignment _horizontalAlignment = HAlignment.Stretch;
-        private VAlignment _verticalAlignment = VAlignment.Stretch;
+        private HAlignment _horizontalAlignment = DefaultHAlignment;
+        private VAlignment _verticalAlignment = DefaultVAlignment;
         private Thickness _margin;
         private bool _measuring;
         private bool _arranging;
@@ -53,6 +59,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _margin = value;
+                SetLayoutStyleProp(LayoutStyleProperties.Margin);
                 InvalidateMeasure();
             }
         }
@@ -242,6 +249,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _horizontalAlignment = value;
+                SetLayoutStyleProp(LayoutStyleProperties.HorizontalAlignment);
                 InvalidateArrange();
             }
         }
@@ -258,6 +266,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _verticalAlignment = value;
+                SetLayoutStyleProp(LayoutStyleProperties.VerticalAlignment);
                 InvalidateArrange();
             }
         }
@@ -276,6 +285,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _horizontalExpand = value;
+                SetLayoutStyleProp(LayoutStyleProperties.HorizontalExpand);
                 Parent?.InvalidateMeasure();
             }
         }
@@ -294,6 +304,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _verticalExpand = value;
+                SetLayoutStyleProp(LayoutStyleProperties.VerticalExpand);
                 Parent?.InvalidateArrange();
             }
         }
@@ -318,6 +329,7 @@ namespace Robust.Client.UserInterface
 
                 _sizeFlagsStretchRatio = value;
 
+                SetLayoutStyleProp(LayoutStyleProperties.StretchRatio);
                 Parent?.InvalidateArrange();
             }
         }
@@ -394,6 +406,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _minWidth = value;
+                SetLayoutStyleProp(LayoutStyleProperties.MinWidth);
                 InvalidateMeasure();
             }
         }
@@ -408,6 +421,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _minHeight = value;
+                SetLayoutStyleProp(LayoutStyleProperties.MinHeight);
                 InvalidateMeasure();
             }
         }
@@ -422,6 +436,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _setWidth = value;
+                SetLayoutStyleProp(LayoutStyleProperties.SetWidth);
                 InvalidateMeasure();
             }
         }
@@ -436,6 +451,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _setHeight = value;
+                SetLayoutStyleProp(LayoutStyleProperties.SetHeight);
                 InvalidateMeasure();
             }
         }
@@ -450,6 +466,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _maxWidth = value;
+                SetLayoutStyleProp(LayoutStyleProperties.MaxWidth);
                 InvalidateMeasure();
             }
         }
@@ -464,6 +481,7 @@ namespace Robust.Client.UserInterface
             set
             {
                 _maxHeight = value;
+                SetLayoutStyleProp(LayoutStyleProperties.MaxHeight);
                 InvalidateMeasure();
             }
         }

Robust.Client/UserInterface/Control.Styling.cs

@@ -239,6 +239,7 @@ namespace Robust.Client.UserInterface
 
         protected virtual void StylePropertiesChanged()
         {
+            UpdateLayoutStyleProperties();
             InvalidateMeasure();
         }
 

Robust.Client/UserInterface/Control.cs

@@ -641,7 +641,11 @@ namespace Robust.Client.UserInterface
 
             foreach (var child in Children.ToArray())
             {
-                RemoveChild(child);
+                // This checks fails in some obscure cases like using the element inspector in the dev window.
+                // Why? Well I could probably spend 15 minutes in a debugger to find out,
+                // but I'd probably still end up with this fix.
+                if (child.Parent == this)
+                    RemoveChild(child);
             }
         }
 

Robust.Client/UserInterface/Controllers/UIController.cs

@@ -5,7 +5,6 @@ using Robust.Shared.Timing;
 
 namespace Robust.Client.UserInterface.Controllers;
 
-// Notices your UIController, *UwU Whats this?*
 /// <summary>
 ///     Each <see cref="UIController"/> is instantiated as a singleton by <see cref="UserInterfaceManager"/>
 ///     <see cref="UIController"/> can use <see cref="DependencyAttribute"/> for regular IoC dependencies

Robust.Client/UserInterface/Controls/LineEdit.cs

@@ -4,6 +4,8 @@ using System.Numerics;
 using System.Text;
 using JetBrains.Annotations;
 using Robust.Client.Graphics;
+using Robust.Shared;
+using Robust.Shared.Configuration;
 using Robust.Shared.Input;
 using Robust.Shared.IoC;
 using Robust.Shared.Maths;
@@ -20,6 +22,8 @@ namespace Robust.Client.UserInterface.Controls
     public class LineEdit : Control
     {
         [Dependency] private readonly IClyde _clyde = default!;
+        [Dependency] private readonly IConfigurationManager _cfgManager = default!;
+        [Dependency] private readonly IGameTiming _timing = default!;
 
         private const float MouseScrollDelay = 0.001f;
 
@@ -46,6 +50,9 @@ namespace Robust.Client.UserInterface.Controls
         private bool _mouseSelectingText;
         private float _lastMousePosition;
 
+        private TimeSpan? _lastClickTime;
+        private Vector2? _lastClickPosition;
+
         private bool IsPlaceHolderVisible => string.IsNullOrEmpty(_text) && _placeHolder != null;
 
         public event Action<LineEditEventArgs>? OnTextChanged;
@@ -685,8 +692,26 @@ namespace Robust.Client.UserInterface.Controls
                     args.Handle();
                 }
             }
+            // Double-clicking. Clicks delay should be <= 250ms and the distance < 10 pixels.
+            else if (args.Function == EngineKeyFunctions.UIClick && _lastClickPosition != null && _lastClickTime != null
+                     && _timing.RealTime - _lastClickTime <= TimeSpan.FromMilliseconds(_cfgManager.GetCVar(CVars.DoubleClickDelay))
+                     && (_lastClickPosition.Value - args.PointerLocation.Position).IsShorterThan(_cfgManager.GetCVar(CVars.DoubleClickRange)))
+            {
+                _lastClickTime = _timing.RealTime;
+                _lastClickPosition = args.PointerLocation.Position;
+
+                _lastMousePosition = args.RelativePosition.X;
+
+                _selectionStart = TextEditShared.PrevWordPosition(_text, GetIndexAtPos(args.RelativePosition.X));
+                _cursorPosition = TextEditShared.EndWordPosition(_text, GetIndexAtPos(args.RelativePosition.X));
+
+                args.Handle();
+            }
             else
             {
+                _lastClickTime = _timing.RealTime;
+                _lastClickPosition = args.PointerLocation.Position;
+
                 _mouseSelectingText = true;
                 _lastMousePosition = args.RelativePosition.X;
 

Robust.Client/UserInterface/Controls/RichTextLabel.cs

@@ -6,6 +6,7 @@ using Robust.Client.UserInterface.RichText;
 using Robust.Shared.IoC;
 using Robust.Shared.Maths;
 using Robust.Shared.Utility;
+using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.UserInterface.Controls
 {
@@ -16,6 +17,26 @@ namespace Robust.Client.UserInterface.Controls
 
         private FormattedMessage? _message;
         private RichTextEntry _entry;
+        private float _lineHeightScale = 1;
+        private bool _lineHeightOverride;
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public float LineHeightScale
+        {
+            get
+            {
+                if (!_lineHeightOverride && TryGetStyleProperty(nameof(LineHeightScale), out float value))
+                    return value;
+
+                return _lineHeightScale;
+            }
+            set
+            {
+                _lineHeightScale = value;
+                _lineHeightOverride = true;
+                InvalidateMeasure();
+            }
+        }
 
         public RichTextLabel()
         {
@@ -47,7 +68,7 @@ namespace Robust.Client.UserInterface.Controls
             }
 
             var font = _getFont();
-            _entry.Update(font, availableSize.X * UIScale, UIScale);
+            _entry.Update(font, availableSize.X * UIScale, UIScale, LineHeightScale);
 
             return new Vector2(_entry.Width / UIScale, _entry.Height / UIScale);
         }
@@ -61,7 +82,7 @@ namespace Robust.Client.UserInterface.Controls
                 return;
             }
 
-            _entry.Draw(handle, _getFont(), SizeBox, 0, new MarkupDrawingContext(), UIScale);
+            _entry.Draw(handle, _getFont(), SizeBox, 0, new MarkupDrawingContext(), UIScale, LineHeightScale);
         }
 
         [Pure]

Robust.Client/UserInterface/Controls/ScrollContainer.cs

@@ -123,10 +123,10 @@ namespace Robust.Client.UserInterface.Controls
             if (!ReturnMeasure)
                 return Vector2.Zero;
 
-            if (_vScrollEnabled)
+            if (_vScrollEnabled && size.Y >= availableSize.Y)
                 size.X += _vScrollBar.DesiredSize.X;
 
-            if (_hScrollEnabled)
+            if (_hScrollEnabled && size.X >= availableSize.X)
                 size.Y += _hScrollBar.DesiredSize.Y;
 
             return size;

Robust.Client/UserInterface/Controls/Slider.cs

@@ -2,6 +2,7 @@
 using System.Numerics;
 using Robust.Client.Graphics;
 using Robust.Shared.Input;
+using Robust.Shared.Log;
 using Robust.Shared.Maths;
 using static Robust.Client.UserInterface.Controls.LayoutContainer;
 
@@ -32,6 +33,11 @@ namespace Robust.Client.UserInterface.Controls
 
         public bool Grabbed => _grabbed;
 
+        /// <summary>
+        /// Whether the slider can be adjusted.
+        /// </summary>
+        public bool Disabled { get; set; }
+
         public StyleBox? ForegroundStyleBoxOverride
         {
             get => _foregroundStyleBoxOverride;
@@ -132,7 +138,7 @@ namespace Robust.Client.UserInterface.Controls
         {
             base.KeyBindDown(args);
 
-            if (args.Function != EngineKeyFunctions.UIClick)
+            if (args.Function != EngineKeyFunctions.UIClick || Disabled)
             {
                 return;
             }
@@ -146,7 +152,7 @@ namespace Robust.Client.UserInterface.Controls
         {
             base.KeyBindUp(args);
 
-            if (args.Function != EngineKeyFunctions.UIClick) return;
+            if (args.Function != EngineKeyFunctions.UIClick || !_grabbed) return;
 
             _grabbed = false;
             OnReleased?.Invoke(this);

Robust.Client/UserInterface/Controls/VerticalTabContainer.xaml

@@ -0,0 +1,34 @@
+<!-- Organised with tabs in a vertical list to the left and the contents to the right -->
+<BoxContainer Name="Container" xmlns="https://spacestation14.io"
+              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+              xmlns:graphics="clr-namespace:Robust.Client.Graphics"
+              Orientation="Horizontal"
+              MouseFilter="Pass">
+    <ScrollContainer VerticalExpand="True"
+                     HScrollEnabled="False"
+                     ReturnMeasure="True"
+                     Margin="5 5 0 5">
+        <PanelContainer Margin="5" VerticalExpand="False"
+                        VerticalAlignment="Top">
+            <PanelContainer.PanelOverride>
+                <graphics:StyleBoxFlat BackgroundColor="#1B1B1E" />
+            </PanelContainer.PanelOverride>
+            <BoxContainer Name="TabContainer" Margin="5" Orientation="Vertical"/>
+        </PanelContainer>
+        </ScrollContainer>
+    <ScrollContainer VerticalExpand="True"
+                     HScrollEnabled="False"
+                     HorizontalAlignment="Stretch"
+                     HorizontalExpand="True"
+                     ReturnMeasure="True"
+                     Margin="0 5 5 5">
+        <PanelContainer Margin="5" HorizontalExpand="True" HorizontalAlignment="Stretch">
+            <PanelContainer.PanelOverride>
+                <graphics:StyleBoxFlat BackgroundColor="#1B1B1E" />
+            </PanelContainer.PanelOverride>
+            <BoxContainer Margin="5"
+                          Orientation="Vertical"
+                          Name="ContentsContainer"/>
+        </PanelContainer>
+    </ScrollContainer>
+</BoxContainer>

Robust.Client/UserInterface/Controls/VerticalTabContainer.xaml.cs

@@ -0,0 +1,97 @@
+using System.Collections.Generic;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.UserInterface.Controls;
+
+[GenerateTypedNameReferences]
+public sealed partial class VerticalTabContainer : BoxContainer
+{
+    private readonly Dictionary<Control, BaseButton> _tabs = new();
+
+    // Just used to order controls in case one gets removed.
+    private readonly List<Control> _controls = new();
+
+    private readonly ButtonGroup _tabGroup = new(false);
+
+    private Control? _currentControl;
+
+    public VerticalTabContainer()
+    {
+        RobustXamlLoader.Load(this);
+    }
+
+    public int AddTab(Control control, string title)
+    {
+        var button = new Button()
+        {
+            Text = title,
+            Group = _tabGroup,
+        };
+
+        TabContainer.AddChild(button);
+        ContentsContainer.AddChild(control);
+        var index = ChildCount - 1;
+        button.OnPressed += args =>
+        {
+            SelectTab(control);
+        };
+
+        _controls.Add(control);
+        _tabs.Add(control, button);
+
+        // Existing tabs
+        if (ContentsContainer.ChildCount > 1)
+        {
+            control.Visible = false;
+        }
+        // First tab
+        else
+        {
+            SelectTab(control);
+        }
+
+        return index;
+    }
+
+    protected override void ChildRemoved(Control child)
+    {
+        if (_tabs.Remove(child, out var button))
+        {
+            button.Dispose();
+        }
+
+        // Set the current tab to a different control
+        if (_currentControl == child)
+        {
+            var previous = _controls.IndexOf(child) - 1;
+
+            if (previous > -1)
+            {
+                var setControl = _controls[previous];
+                SelectTab(setControl);
+            }
+            else
+            {
+                _currentControl = null;
+            }
+        }
+
+        _controls.Remove(child);
+        base.ChildRemoved(child);
+    }
+
+    private void SelectTab(Control control)
+    {
+        if (_currentControl != null)
+        {
+            _currentControl.Visible = false;
+        }
+
+        var button = _tabs[control];
+        button.Pressed = true;
+        control.Visible = true;
+        _currentControl = control;
+    }
+}

Robust.Client/UserInterface/CustomControls/DebugMonitorControls/DebugCoordsPanel.cs

@@ -20,6 +20,7 @@ namespace Robust.Client.UserInterface.CustomControls.DebugMonitorControls
         [Dependency] private readonly IEntityManager _entityManager = default!;
         [Dependency] private readonly IClyde _displayManager = default!;
         [Dependency] private readonly IMapManager _mapManager = default!;
+        [Dependency] private readonly IBaseClient _baseClient = default!;
 
         private readonly StringBuilder _textBuilder = new();
         private readonly char[] _textBuffer = new char[1024];
@@ -58,30 +59,36 @@ namespace Robust.Client.UserInterface.CustomControls.DebugMonitorControls
 
             _textBuilder.Clear();
 
+            var isInGame = _baseClient.RunLevel.IsInGameLike();
             var mouseScreenPos = _inputManager.MouseScreenPosition;
             var screenSize = _displayManager.ScreenSize;
             var screenScale = _displayManager.MainWindow.ContentScale;
 
-            EntityCoordinates mouseGridPos;
-            TileRef tile;
+            EntityCoordinates mouseGridPos = default;
+            TileRef tile = default;
+            MapCoordinates mouseWorldMap = default;
 
-            var mouseWorldMap = _eyeManager.PixelToMap(mouseScreenPos);
-            if (mouseWorldMap == MapCoordinates.Nullspace)
-                return;
-
-            var mapSystem = _entityManager.System<SharedMapSystem>();
-            var xformSystem = _entityManager.System<SharedTransformSystem>();
-
-            if (_mapManager.TryFindGridAt(mouseWorldMap, out var mouseGridUid, out var mouseGrid))
+            if (isInGame)
             {
-                mouseGridPos = mapSystem.MapToGrid(mouseGridUid, mouseWorldMap);
-                tile = mapSystem.GetTileRef(mouseGridUid, mouseGrid, mouseGridPos);
-            }
-            else
-            {
-                mouseGridPos = new EntityCoordinates(_mapManager.GetMapEntityId(mouseWorldMap.MapId),
-                    mouseWorldMap.Position);
-                tile = new TileRef(EntityUid.Invalid, mouseGridPos.ToVector2i(_entityManager, _mapManager, xformSystem), Tile.Empty);
+                mouseWorldMap = _eyeManager.PixelToMap(mouseScreenPos);
+                if (mouseWorldMap != MapCoordinates.Nullspace)
+                {
+                    var mapSystem = _entityManager.System<SharedMapSystem>();
+                    var xformSystem = _entityManager.System<SharedTransformSystem>();
+
+                    if (_mapManager.TryFindGridAt(mouseWorldMap, out var mouseGridUid, out var mouseGrid))
+                    {
+                        mouseGridPos = mapSystem.MapToGrid(mouseGridUid, mouseWorldMap);
+                        tile = mapSystem.GetTileRef(mouseGridUid, mouseGrid, mouseGridPos);
+                    }
+                    else
+                    {
+                        mouseGridPos = new EntityCoordinates(_mapManager.GetMapEntityId(mouseWorldMap.MapId),
+                            mouseWorldMap.Position);
+                        tile = new TileRef(EntityUid.Invalid,
+                            mouseGridPos.ToVector2i(_entityManager, _mapManager, xformSystem), Tile.Empty);
+                    }
+                }
             }
 
             var controlHovered = UserInterfaceManager.CurrentlyHovered;
@@ -95,32 +102,37 @@ Mouse Pos:
     {tile}
     GUI: {controlHovered}");
 
-            _textBuilder.AppendLine("\nAttached NetEntity:");
-            var controlledEntity = _playerManager.LocalSession?.AttachedEntity ?? EntityUid.Invalid;
-
-            if (controlledEntity == EntityUid.Invalid)
+            if (isInGame)
             {
-                _textBuilder.AppendLine("No attached netentity.");
-            }
-            else
-            {
-                var entityTransform = _entityManager.GetComponent<TransformComponent>(controlledEntity);
-                var playerWorldOffset = xformSystem.GetMapCoordinates(entityTransform);
-                var playerScreen = _eyeManager.WorldToScreen(playerWorldOffset.Position);
+                var xformSystem = _entityManager.System<SharedTransformSystem>();
 
-                var playerCoordinates = entityTransform.Coordinates;
-                var playerRotation = xformSystem.GetWorldRotation(entityTransform);
-                var gridRotation = entityTransform.GridUid != null
-                    ? xformSystem.GetWorldRotation(entityTransform.GridUid.Value)
-                    : Angle.Zero;
+                _textBuilder.AppendLine("\nAttached NetEntity:");
+                var controlledEntity = _playerManager.LocalSession?.AttachedEntity ?? EntityUid.Invalid;
 
-                _textBuilder.Append($@"    Screen: {playerScreen}
+                if (controlledEntity == EntityUid.Invalid)
+                {
+                    _textBuilder.AppendLine("No attached netentity.");
+                }
+                else
+                {
+                    var entityTransform = _entityManager.GetComponent<TransformComponent>(controlledEntity);
+                    var playerWorldOffset = xformSystem.GetMapCoordinates(entityTransform);
+                    var playerScreen = _eyeManager.WorldToScreen(playerWorldOffset.Position);
+
+                    var playerCoordinates = entityTransform.Coordinates;
+                    var playerRotation = xformSystem.GetWorldRotation(entityTransform);
+                    var gridRotation = entityTransform.GridUid != null
+                        ? xformSystem.GetWorldRotation(entityTransform.GridUid.Value)
+                        : Angle.Zero;
+
+                    _textBuilder.Append($@"    Screen: {playerScreen}
     {playerWorldOffset}
     {_entityManager.GetNetCoordinates(playerCoordinates)}
     Rotation: {playerRotation.Degrees:F2}°
     NEntId: {_entityManager.GetNetEntity(controlledEntity)}
     Grid NEntId: {_entityManager.GetNetEntity(entityTransform.GridUid)}
     Grid Rotation: {gridRotation.Degrees:F2}°");
+                }
             }
 
             _contents.TextMemory = FormatHelpers.BuilderToMemory(_textBuilder, _textBuffer);

Robust.Client/UserInterface/RichText/FontPrototype.cs

@@ -5,7 +5,7 @@ using Robust.Shared.Utility;
 namespace Robust.Client.UserInterface.RichText;
 
 [Prototype("font")]
-public sealed class FontPrototype : IPrototype
+public sealed partial class FontPrototype : IPrototype
 {
     [IdDataField]
     public string ID { get; private set; } = default!;

Robust.Client/UserInterface/RichTextEntry.cs

@@ -71,7 +71,8 @@ namespace Robust.Client.UserInterface
         /// <param name="defaultFont">The font being used for display.</param>
         /// <param name="maxSizeX">The maximum horizontal size of the container of this entry.</param>
         /// <param name="uiScale"></param>
-        public void Update(Font defaultFont, float maxSizeX, float uiScale)
+        /// <param name="lineHeightScale"></param>
+        public void Update(Font defaultFont, float maxSizeX, float uiScale, float lineHeightScale = 1)
         {
             // This method is gonna suck due to complexity.
             // Bear with me here.
@@ -159,7 +160,7 @@ namespace Robust.Client.UserInterface
                     if (!context.Font.TryPeek(out var font))
                         font = defaultFont;
 
-                    src.Height += font.GetLineHeight(uiScale);
+                    src.Height += GetLineHeight(font, uiScale, lineHeightScale);
                 }
             }
         }
@@ -170,7 +171,8 @@ namespace Robust.Client.UserInterface
             UIBox2 drawBox,
             float verticalOffset,
             MarkupDrawingContext context,
-            float uiScale)
+            float uiScale,
+            float lineHeightScale = 1)
         {
             context.Clear();
             context.Color.Push(_defaultColor);
@@ -197,7 +199,7 @@ namespace Robust.Client.UserInterface
                     if (lineBreakIndex < LineBreaks.Count &&
                         LineBreaks[lineBreakIndex] == globalBreakCounter)
                     {
-                        baseLine = new Vector2(drawBox.Left, baseLine.Y + font.GetLineHeight(uiScale) + controlYAdvance);
+                        baseLine = new Vector2(drawBox.Left, baseLine.Y + GetLineHeight(font, uiScale, lineHeightScale) + controlYAdvance);
                         controlYAdvance = 0;
                         lineBreakIndex += 1;
                     }
@@ -216,7 +218,7 @@ namespace Robust.Client.UserInterface
                 control.Position = new Vector2(baseLine.X * invertedScale, (baseLine.Y - defaultFont.GetAscent(uiScale)) * invertedScale);
                 control.Measure(new Vector2(Width, Height));
                 var advanceX = control.DesiredPixelSize.X;
-                controlYAdvance = Math.Max(0f, (control.DesiredPixelSize.Y - font.GetLineHeight(uiScale)) * invertedScale);
+                controlYAdvance = Math.Max(0f, (control.DesiredPixelSize.Y - GetLineHeight(font, uiScale, lineHeightScale)) * invertedScale);
                 baseLine += new Vector2(advanceX, 0);
             }
         }
@@ -242,5 +244,11 @@ namespace Robust.Client.UserInterface
             tag.PopDrawContext(node, context);
             return tag.TextAfter(node);
         }
+
+        private static int GetLineHeight(Font font, float uiScale, float lineHeightScale)
+        {
+            var height = font.GetLineHeight(uiScale);
+            return (int)(height * lineHeightScale);
+        }
     }
 }

Robust.Client/UserInterface/Themes/UiTheme.cs

@@ -1,12 +1,10 @@
 using System;
 using System.Collections.Frozen;
-using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using Robust.Client.Graphics;
 using Robust.Client.ResourceManagement;
 using Robust.Shared.ContentPack;
-using Robust.Shared.Graphics;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Maths;
@@ -18,7 +16,7 @@ using Robust.Shared.ViewVariables;
 namespace Robust.Client.UserInterface.Themes;
 
 [Prototype("uiTheme")]
-public sealed class UITheme : IPrototype
+public sealed partial class UITheme : IPrototype
 {
     private IResourceCache? _cache;
     private IUserInterfaceManager? _uiMan;

Robust.Client/UserInterface/UserInterfaceManager.Themes.cs

@@ -2,6 +2,7 @@
 using Robust.Client.UserInterface.Themes;
 using Robust.Shared;
 using Robust.Shared.Log;
+using Robust.Shared.Prototypes;
 
 namespace Robust.Client.UserInterface;
 
@@ -18,11 +19,29 @@ internal partial class UserInterfaceManager
     {
         DefaultTheme = _protoManager.Index<UITheme>(UITheme.DefaultName);
         CurrentTheme = DefaultTheme;
+        ReloadThemes();
+        _configurationManager.OnValueChanged(CVars.InterfaceTheme, SetThemeOrPrevious, true);
+        _protoManager.PrototypesReloaded += OnPrototypesReloaded;
+    }
+
+    private void OnPrototypesReloaded(PrototypesReloadedEventArgs eventArgs)
+    {
+        if (eventArgs.WasModified<UITheme>())
+        {
+            _sawmillUI.Debug("Reloading UI themes due to prototype reload");
+            ReloadThemes();
+        }
+    }
+
+    private void ReloadThemes()
+    {
+        _themes.Clear();
         foreach (var proto in _protoManager.EnumeratePrototypes<UITheme>())
         {
             _themes.Add(proto.ID, proto);
         }
-        _configurationManager.OnValueChanged(CVars.InterfaceTheme, SetThemeOrPrevious, true);
+
+        SetThemeOrPrevious(CurrentTheme.ID);
     }
 
     //Try to set the current theme, if the theme is not found do nothing

Robust.Client/ViewVariables/Editors/VVPropEditorSoundSpecifier.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using System.Numerics;
 using Robust.Client.UserInterface;
 using Robust.Client.UserInterface.Controls;
@@ -16,6 +17,10 @@ public sealed class VVPropEditorSoundSpecifier : VVPropEditor
     private readonly IPrototypeManager _protoManager;
     private readonly IResourceManager _resManager;
 
+    // Need to cache to some level just to make sure each edit doesn't reset the specifier to the default.
+
+    private SoundSpecifier? _specifier;
+
     public VVPropEditorSoundSpecifier(IPrototypeManager protoManager, IResourceManager resManager)
     {
         _protoManager = protoManager;
@@ -39,7 +44,7 @@ public sealed class VVPropEditorSoundSpecifier : VVPropEditor
             Editable = !ReadOnly,
         };
 
-        var controls = new BoxContainer()
+        var pathControls = new BoxContainer()
         {
             Orientation = BoxContainer.LayoutOrientation.Horizontal,
             Children =
@@ -57,10 +62,15 @@ public sealed class VVPropEditorSoundSpecifier : VVPropEditor
                 case SoundCollectionSpecifier collection:
                     typeButton.SelectId(1);
                     editBox.Text = collection.Collection ?? string.Empty;
+                    _specifier = collection;
                     break;
                 case SoundPathSpecifier path:
                     typeButton.SelectId(2);
                     editBox.Text = path.Path.ToString();
+                    _specifier = path;
+                    break;
+                default:
+                    _specifier = null;
                     break;
             }
         }
@@ -90,7 +100,11 @@ public sealed class VVPropEditorSoundSpecifier : VVPropEditor
                     if (!_protoManager.HasIndex<SoundCollectionPrototype>(args.Text))
                         return;
 
-                    ValueChanged(new SoundCollectionSpecifier(args.Text));
+                    _specifier = new SoundCollectionSpecifier(args.Text)
+                    {
+                        Params = _specifier?.Params ?? AudioParams.Default,
+                    };
+                    ValueChanged(_specifier);
                     break;
                 case 2:
                     var path = new ResPath(args.Text);
@@ -98,13 +112,282 @@ public sealed class VVPropEditorSoundSpecifier : VVPropEditor
                     if (!_resManager.ContentFileExists(path))
                         return;
 
-                    ValueChanged(new SoundPathSpecifier(args.Text));
+                    _specifier = new SoundPathSpecifier(args.Text)
+                    {
+                        Params = _specifier?.Params ?? AudioParams.Default,
+                    };
+
+                    ValueChanged(_specifier);
                     break;
                 default:
                     return;
             }
         };
 
+        // Audio params
+
+        /* Volume */
+
+        var volumeEdit = new LineEdit()
+        {
+            Text = _specifier?.Params.Volume.ToString(CultureInfo.InvariantCulture) ?? string.Empty,
+            HorizontalExpand = true,
+            Editable = !ReadOnly && _specifier != null,
+        };
+
+        volumeEdit.OnTextEntered += args =>
+        {
+            if (!float.TryParse(args.Text, out var floatValue) || _specifier == null)
+                return;
+
+            _specifier.Params = _specifier.Params.WithVolume(floatValue);
+            ValueChanged(_specifier);
+        };
+
+        var volumeContainer = new BoxContainer()
+        {
+            Orientation = BoxContainer.LayoutOrientation.Horizontal,
+            Children =
+            {
+                new Label()
+                {
+                    Text = Loc.GetString("vv-sound-volume"),
+                },
+                volumeEdit,
+            }
+        };
+
+        /* Pitch */
+
+        var pitchEdit = new LineEdit()
+        {
+            Text = _specifier?.Params.Pitch.ToString(CultureInfo.InvariantCulture) ?? string.Empty,
+            HorizontalExpand = true,
+            Editable = !ReadOnly && _specifier != null,
+        };
+
+        pitchEdit.OnTextEntered += args =>
+        {
+            if (!float.TryParse(args.Text, out var floatValue) || _specifier == null)
+                return;
+
+            _specifier.Params = _specifier.Params.WithPitchScale(floatValue);
+            ValueChanged(_specifier);
+        };
+
+        var pitchContainer = new BoxContainer()
+        {
+            Orientation = BoxContainer.LayoutOrientation.Horizontal,
+            Children =
+            {
+                new Label()
+                {
+                    Text = Loc.GetString("vv-sound-pitch"),
+                },
+                pitchEdit,
+            }
+        };
+
+        /* MaxDistance */
+
+        var maxDistanceEdit = new LineEdit()
+        {
+            Text = _specifier?.Params.MaxDistance.ToString(CultureInfo.InvariantCulture) ?? string.Empty,
+            HorizontalExpand = true,
+            Editable = !ReadOnly && _specifier != null,
+        };
+
+        maxDistanceEdit.OnTextEntered += args =>
+        {
+            if (!float.TryParse(args.Text, out var floatValue) || _specifier == null)
+                return;
+
+            _specifier.Params = _specifier.Params.WithMaxDistance(floatValue);
+            ValueChanged(_specifier);
+        };
+
+        var maxDistanceContainer = new BoxContainer()
+        {
+            Orientation = BoxContainer.LayoutOrientation.Horizontal,
+            Children =
+            {
+                new Label()
+                {
+                    Text = Loc.GetString("vv-sound-max-distance"),
+                },
+                maxDistanceEdit,
+            }
+        };
+
+        /* RolloffFactor */
+
+        var rolloffFactorEdit = new LineEdit()
+        {
+            Text = _specifier?.Params.RolloffFactor.ToString(CultureInfo.InvariantCulture) ?? string.Empty,
+            HorizontalExpand = true,
+            Editable = !ReadOnly && _specifier != null,
+        };
+
+        rolloffFactorEdit.OnTextEntered += args =>
+        {
+            if (!float.TryParse(args.Text, out var floatValue) || _specifier == null)
+                return;
+
+            _specifier.Params = _specifier.Params.WithRolloffFactor(floatValue);
+            ValueChanged(_specifier);
+        };
+
+        var rolloffFactorContainer = new BoxContainer()
+        {
+            Orientation = BoxContainer.LayoutOrientation.Horizontal,
+            Children =
+            {
+                new Label()
+                {
+                    Text = Loc.GetString("vv-sound-rolloff-factor"),
+                },
+                rolloffFactorEdit,
+            }
+        };
+
+        /* ReferenceDistance */
+
+        var referenceDistanceEdit = new LineEdit()
+        {
+            Text = _specifier?.Params.ReferenceDistance.ToString(CultureInfo.InvariantCulture) ?? string.Empty,
+            HorizontalExpand = true,
+            Editable = !ReadOnly && _specifier != null,
+        };
+
+        referenceDistanceEdit.OnTextEntered += args =>
+        {
+            if (!float.TryParse(args.Text, out var floatValue) || _specifier == null)
+                return;
+
+            _specifier.Params = _specifier.Params.WithReferenceDistance(floatValue);
+            ValueChanged(_specifier);
+        };
+
+        var referenceDistanceContainer = new BoxContainer()
+        {
+            Orientation = BoxContainer.LayoutOrientation.Horizontal,
+            Children =
+            {
+                new Label()
+                {
+                    Text = Loc.GetString("vv-sound-reference-distance"),
+                },
+                referenceDistanceEdit,
+            }
+        };
+
+        /* Loop */
+
+        var loopButton = new Button()
+        {
+            Text = Loc.GetString("vv-sound-loop"),
+            Pressed = _specifier?.Params.Loop ?? false,
+            ToggleMode = true,
+            Disabled = ReadOnly || _specifier == null,
+        };
+
+        loopButton.OnPressed += args =>
+        {
+            if (_specifier == null)
+                return;
+
+            _specifier.Params = _specifier.Params.WithLoop(args.Button.Pressed);
+            ValueChanged(_specifier);
+        };
+
+        /* PlayOffsetSeconds */
+
+        var playOffsetEdit = new LineEdit()
+        {
+            Text = _specifier?.Params.PlayOffsetSeconds.ToString(CultureInfo.InvariantCulture) ?? string.Empty,
+            HorizontalExpand = true,
+            Editable = !ReadOnly && _specifier != null,
+        };
+
+        playOffsetEdit.OnTextEntered += args =>
+        {
+            if (!float.TryParse(args.Text, out var floatValue) || _specifier == null)
+                return;
+
+            _specifier.Params = _specifier.Params.WithPlayOffset(floatValue);
+            ValueChanged(_specifier);
+        };
+
+        var playOffsetContainer = new BoxContainer()
+        {
+            Orientation = BoxContainer.LayoutOrientation.Horizontal,
+            Children =
+            {
+                new Label()
+                {
+                    Text = Loc.GetString("vv-sound-play-offset"),
+                },
+                playOffsetEdit,
+            }
+        };
+
+        /* Variation */
+
+        var variationEdit = new LineEdit()
+        {
+            Text = _specifier?.Params.Variation.ToString() ?? string.Empty,
+            HorizontalExpand = true,
+            Editable = !ReadOnly && _specifier != null,
+        };
+
+        variationEdit.OnTextEntered += args =>
+        {
+            if (!float.TryParse(args.Text, out var floatValue) || _specifier == null)
+                return;
+
+            _specifier.Params = _specifier.Params.WithVariation(floatValue);
+            ValueChanged(_specifier);
+        };
+
+        var variationContainer = new BoxContainer()
+        {
+            Orientation = BoxContainer.LayoutOrientation.Horizontal,
+            Children =
+            {
+                new Label()
+                {
+                    Text = Loc.GetString("vv-sound-variation"),
+                },
+                variationEdit,
+            }
+        };
+
+        var audioParamsControls = new BoxContainer()
+        {
+            Orientation = BoxContainer.LayoutOrientation.Vertical,
+            Children =
+            {
+                volumeContainer,
+                pitchContainer,
+                maxDistanceContainer,
+                rolloffFactorContainer,
+                referenceDistanceContainer,
+                loopButton,
+                playOffsetContainer,
+                variationContainer,
+            }
+        };
+
+        var controls = new BoxContainer()
+        {
+            Orientation = BoxContainer.LayoutOrientation.Vertical,
+            Children =
+            {
+                pathControls,
+                audioParamsControls,
+            }
+        };
+
         return controls;
     }
 }

Robust.Roslyn.Shared/Diagnostics.cs

@@ -28,6 +28,7 @@ public static class Diagnostics
     public const string IdComponentPauseNoFields = "RA0022";
     public const string IdComponentPauseNoParentAttribute = "RA0023";
     public const string IdComponentPauseWrongTypeAttribute = "RA0024";
+    public const string IdDependencyFieldAssigned = "RA0025";
 
     public static SuppressionDescriptor MeansImplicitAssignment =>
         new SuppressionDescriptor("RADC1000", "CS0649", "Marked as implicitly assigned.");

Robust.Server/Console/Commands/TestbedCommand.cs

@@ -70,6 +70,11 @@ namespace Robust.Server.Console.Commands
             }
 
             var mapId = new MapId(mapInt);
+            if (!_map.MapExists(mapId))
+            {
+                shell.WriteError($"map {args[0]} does not exist");
+                return;
+            }
 
             if (shell.Player == null)
             {
@@ -110,13 +115,6 @@ namespace Robust.Server.Console.Commands
 
         private void SetupPlayer(MapId mapId, IConsoleShell shell)
         {
-            if (mapId == MapId.Nullspace) return;
-
-            if (!_map.MapExists(mapId))
-            {
-                _map.CreateMap(mapId);
-            }
-
             _map.SetMapPaused(mapId, false);
             var mapUid = _map.GetMapEntityIdOrThrow(mapId);
             _ent.System<Gravity2DController>().SetGravity(mapUid, new Vector2(0, -9.8f));

Robust.Server/GameObjects/EntitySystems/MapLoaderSystem.cs

@@ -49,7 +49,6 @@ public sealed class MapLoaderSystem : EntitySystem
     private ISawmill _logLoader = default!;
     private ISawmill _logWriter = default!;
 
-    private static readonly MapLoadOptions DefaultLoadOptions = new();
     private const int MapFormatVersion = 6;
     private const int BackwardsVersion = 2;
 
@@ -132,7 +131,7 @@ public sealed class MapLoaderSystem : EntitySystem
     public bool TryLoad(MapId mapId, string path, [NotNullWhen(true)] out IReadOnlyList<EntityUid>? rootUids,
         MapLoadOptions? options = null)
     {
-        options ??= DefaultLoadOptions;
+        options ??= new();
 
         var resPath = new ResPath(path).ToRootedPath();
 
@@ -280,6 +279,9 @@ public sealed class MapLoaderSystem : EntitySystem
         // Load the prototype data onto entities, e.g. transform parents, etc.
         LoadEntities(data);
 
+        // Assign MapSaveTileMapComponent to all read grids.
+        SaveGridTileMap(data);
+
         // Build the scene graph / transform hierarchy to know the order to startup entities.
         // This also allows us to swap out the root node up front if necessary.
         BuildEntityHierarchy(data);
@@ -576,6 +578,19 @@ public sealed class MapLoaderSystem : EntitySystem
             meta.LastComponentRemoved = _timing.CurTick;
     }
 
+    private void SaveGridTileMap(MapData mapData)
+    {
+        DebugTools.Assert(_context.TileMap != null);
+
+        foreach (var entity in mapData.EntitiesToDeserialize.Keys)
+        {
+            if (HasComp<MapGridComponent>(entity))
+            {
+                EnsureComp<MapSaveTileMapComponent>(entity).TileMap = _context.TileMap;
+            }
+        }
+    }
+
     private void BuildEntityHierarchy(MapData mapData)
     {
         _stopwatch.Restart();
@@ -642,11 +657,13 @@ public sealed class MapLoaderSystem : EntitySystem
         var xformQuery = GetEntityQuery<TransformComponent>();
         // We just need to cache the old mapuid and point to the new mapuid.
 
-        if (HasComp<MapComponent>(rootNode))
+        if (TryComp(rootNode, out MapComponent? mapComp))
         {
             // If map exists swap out
-            if (_mapManager.MapExists(data.TargetMap))
+            if (_mapSystem.TryGetMap(data.TargetMap, out var existing))
             {
+                data.Options.DoMapInit |= _mapSystem.IsInitialized(data.TargetMap);
+                data.MapIsPaused = _mapSystem.IsPaused(existing.Value);
                 // Map exists but we also have a map file with stuff on it soooo swap out the old map.
                 if (data.Options.LoadMap)
                 {
@@ -659,26 +676,28 @@ public sealed class MapLoaderSystem : EntitySystem
                         data.Options.Rotation = Angle.Zero;
                     }
 
-                    _mapManager.SetMapEntity(data.TargetMap, rootNode);
+                    Del(existing);
                     EnsureComp<LoadedMapComponent>(rootNode);
+
+                    mapComp.MapId = data.TargetMap;
+                    DebugTools.Assert(mapComp.LifeStage < ComponentLifeStage.Initializing);
                 }
                 // Otherwise just ignore the map in the file.
                 else
                 {
                     var oldRootUid = data.Entities[0];
-                    var newRootUid = _mapManager.GetMapEntityId(data.TargetMap);
-                    data.Entities[0] = newRootUid;
+                    data.Entities[0] = existing.Value;
 
                     foreach (var ent in data.Entities)
                     {
-                        if (ent == newRootUid)
+                        if (ent == existing)
                             continue;
 
                         var xform = xformQuery.GetComponent(ent);
 
                         if (!xform.ParentUid.IsValid() || xform.ParentUid.Equals(oldRootUid))
                         {
-                            _transform.SetParent(ent, xform, newRootUid);
+                            _transform.SetParent(ent, xform, existing.Value);
                         }
                     }
 
@@ -687,16 +706,9 @@ public sealed class MapLoaderSystem : EntitySystem
             }
             else
             {
-                // If we're loading a file with a map then swap out the entityuid
-                // TODO: Mapmanager nonsense
-                var AAAAA = _mapManager.CreateMap(data.TargetMap);
-
-                if (!data.MapIsPostInit)
-                {
-                    _mapManager.AddUninitializedMap(data.TargetMap);
-                }
-
-                _mapManager.SetMapEntity(data.TargetMap, rootNode);
+                data.MapIsPaused = !data.MapIsPostInit;
+                mapComp.MapId = data.TargetMap;
+                DebugTools.Assert(mapComp.LifeStage < ComponentLifeStage.Initializing);
                 EnsureComp<LoadedMapComponent>(rootNode);
 
                 // Nothing should have invalid uid except for the root node.
@@ -705,17 +717,15 @@ public sealed class MapLoaderSystem : EntitySystem
         else
         {
             // No map file root, in that case create a new map / get the one we're loading onto.
-            var mapNode = _mapManager.GetMapEntityId(data.TargetMap);
-
-            if (!mapNode.IsValid())
+            if (!_mapSystem.TryGetMap(data.TargetMap, out var mapNode))
             {
                 // Map doesn't exist so we'll start it up now so we can re-attach the preinit entities to it for later.
-                _mapManager.CreateMap(data.TargetMap);
-                _mapManager.AddUninitializedMap(data.TargetMap);
-                mapNode = _mapManager.GetMapEntityId(data.TargetMap);
-                DebugTools.Assert(mapNode.IsValid());
+                mapNode = _mapSystem.CreateMap(data.TargetMap, false);
             }
 
+            data.Options.DoMapInit |= _mapSystem.IsInitialized(data.TargetMap);
+            data.MapIsPaused = _mapSystem.IsPaused(mapNode.Value);
+
             // If anything has an invalid parent (e.g. it's some form of root node) then parent it to the map.
             foreach (var ent in data.Entities)
             {
@@ -727,12 +737,11 @@ public sealed class MapLoaderSystem : EntitySystem
 
                 if (!xform.ParentUid.IsValid())
                 {
-                    _transform.SetParent(ent, xform, mapNode);
+                    _transform.SetParent(ent, xform, mapNode.Value);
                 }
             }
         }
 
-        data.MapIsPaused = _mapManager.IsMapPaused(data.TargetMap);
         _logLoader.Debug($"Swapped out root node in {_stopwatch.Elapsed}");
     }
 
@@ -880,7 +889,7 @@ public sealed class MapLoaderSystem : EntitySystem
         {
             EntityManager.SetLifeStage(metadata, EntityLifeStage.MapInitialized);
         }
-        else if (_mapManager.IsMapInitialized(data.TargetMap))
+        else if (data.Options.DoMapInit)
         {
             _serverEntityManager.RunMapInit(uid, metadata);
         }
@@ -948,7 +957,7 @@ public sealed class MapLoaderSystem : EntitySystem
         // Yes, post-init maps do not have EntityLifeStage >= EntityLifeStage.MapInitialized
         bool postInit;
         if (TryComp(uid, out MapComponent? mapComp))
-            postInit = !mapComp.MapPreInit;
+            postInit = mapComp.MapInitialized;
         else
             postInit = metadata.EntityLifeStage >= EntityLifeStage.MapInitialized;
 
@@ -981,28 +990,74 @@ public sealed class MapLoaderSystem : EntitySystem
         var gridQuery = GetEntityQuery<MapGridComponent>();
         var tileDefs = new HashSet<int>();
 
+        Dictionary<int, string>? origTileMap = null;
         foreach (var ent in entities)
         {
             if (!gridQuery.TryGetComponent(ent, out var grid))
                 continue;
 
-            var tileEnumerator = grid.GetAllTilesEnumerator(false);
-
+            var tileEnumerator = _mapSystem.GetAllTilesEnumerator(ent, grid, ignoreEmpty: false);
             while (tileEnumerator.MoveNext(out var tileRef))
             {
                 tileDefs.Add(tileRef.Value.Tile.TypeId);
             }
+
+            if (TryComp(ent, out MapSaveTileMapComponent? saveTileMap))
+                origTileMap ??= saveTileMap.TileMap;
         }
 
+        Dictionary<int, int> tileIdMap;
+        if (origTileMap != null)
+        {
+            tileIdMap = new Dictionary<int, int>();
+
+            // We are re-saving a map, so we have an original tile map we can preserve.
+            foreach (var (origId, prototypeId) in origTileMap)
+            {
+                // Skip removed tile definitions.
+                if (!_tileDefManager.TryGetDefinition(prototypeId, out var definition))
+                    continue;
+
+                tileIdMap.Add(definition.TileId, origId);
+            }
+
+            // Assign new IDs for all new tile types.
+            var nextId = 0;
+            foreach (var tileId in tileDefs)
+            {
+                if (tileIdMap.ContainsKey(tileId))
+                    continue;
+
+                // New tile, assign new ID that isn't taken by original tile map.
+                while (origTileMap.ContainsKey(nextId))
+                {
+                    nextId += 1;
+                }
+
+                tileIdMap.Add(tileId, nextId);
+                nextId += 1;
+            }
+        }
+        else
+        {
+            // Make no-op tile ID map.
+            tileIdMap = tileDefs.ToDictionary(x => x, x => x);
+        }
+
+        DebugTools.Assert(
+            tileIdMap.Count == tileIdMap.Values.Distinct().Count(),
+            "Tile ID map has double mapped values??");
+
+        _context.TileWriteMap = tileIdMap;
+
         var tileMap = new MappingDataNode();
         rootNode.Add("tilemap", tileMap);
-        var ordered = new List<int>(tileDefs);
-        ordered.Sort();
 
-        foreach (var tyleId in ordered)
+        foreach (var (nativeId, mapId) in tileIdMap.OrderBy(x => x.Key))
         {
-            var tileDef = _tileDefManager[tyleId];
-            tileMap.Add(tyleId.ToString(CultureInfo.InvariantCulture), tileDef.ID);
+            tileMap.Add(
+                mapId.ToString(CultureInfo.InvariantCulture),
+                _tileDefManager[nativeId].ID);
         }
     }
 
@@ -1036,17 +1091,17 @@ public sealed class MapLoaderSystem : EntitySystem
         }
     }
 
-    private bool IsSaveable(EntityUid uid, EntityQuery<MetaDataComponent> metaQuery, EntityQuery<TransformComponent> transformQuery)
+    private bool IsSaveable(EntityUid uid)
     {
         // Don't serialize things parented to un savable things.
         // For example clothes inside a person.
         while (uid.IsValid())
         {
-            var meta = metaQuery.GetComponent(uid);
+            var meta = MetaData(uid);
 
             if (meta.EntityDeleted || meta.EntityPrototype?.MapSavable == false) break;
 
-            uid = transformQuery.GetComponent(uid).ParentUid;
+            uid = Transform(uid).ParentUid;
         }
 
         // If we manage to get up to the map (root node) then it's saveable.
@@ -1061,7 +1116,7 @@ public sealed class MapLoaderSystem : EntitySystem
         EntityQuery<TransformComponent> transformQuery,
         EntityQuery<MapSaveIdComponent> saveCompQuery)
     {
-        if (!IsSaveable(uid, metaQuery, transformQuery))
+        if (!IsSaveable(uid))
             return;
 
         entities.Add(uid);
@@ -1176,11 +1231,12 @@ public sealed class MapLoaderSystem : EntitySystem
 
                 foreach (var component in EntityManager.GetComponents(entityUid))
                 {
-                    if (component is MapSaveIdComponent)
+                    var compType = component.GetType();
+                    var registration = _factory.GetRegistration(compType);
+                    if (registration.Unsaved)
                         continue;
 
-                    var compType = component.GetType();
-                    var compName = _factory.GetComponentName(compType);
+                    var compName = registration.Name;
                     _context.CurrentComponent = compName;
                     MappingDataNode? compMapping;
                     MappingDataNode? protMapping = null;

Robust.Server/GameObjects/EntitySystems/MapSystem.cs

@@ -5,9 +5,9 @@ using Robust.Shared.Collections;
 using Robust.Shared.Configuration;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
+using Robust.Shared.Map;
 using Robust.Shared.Map.Components;
 using Robust.Shared.Map.Events;
-using Robust.Shared.Physics.Dynamics;
 
 namespace Robust.Server.GameObjects
 {
@@ -18,6 +18,16 @@ namespace Robust.Server.GameObjects
 
         private bool _deleteEmptyGrids;
 
+        protected override MapId GetNextMapId()
+        {
+            var id = new MapId(++LastMapId);
+            while (MapManager.MapExists(id))
+            {
+                id = new MapId(++LastMapId);
+            }
+            return id;
+        }
+
         protected override void UpdatePvsChunks(Entity<TransformComponent, MetaDataComponent> grid)
         {
             _pvs.GridParentChanged(grid);
@@ -31,11 +41,6 @@ namespace Robust.Server.GameObjects
             Subs.CVar(_cfg, CVars.GameDeleteEmptyGrids, SetGridDeletion, true);
         }
 
-        protected override void OnMapAdd(EntityUid uid, MapComponent component, ComponentAdd args)
-        {
-            EnsureComp<PhysicsMapComponent>(uid);
-        }
-
         private void SetGridDeletion(bool value)
         {
             _deleteEmptyGrids = value;

Robust.Server/GameObjects/MapSaveIdComponent.cs

@@ -9,7 +9,7 @@ namespace Robust.Server.GameObjects
     ///     This component stores the previous map UID of entities from map load.
     ///     This can then be used to re-serialize the entity with the same UID for the merge driver to recognize.
     /// </remarks>
-    [RegisterComponent]
+    [RegisterComponent, UnsavedComponent]
     public sealed partial class MapSaveIdComponent : Component
     {
         public int Uid { get; set; }

Robust.Server/GameObjects/MapSaveTileMapComponent.cs

@@ -0,0 +1,24 @@
+using System.Collections.Generic;
+using Robust.Shared.GameObjects;
+
+namespace Robust.Server.GameObjects;
+
+/// <summary>
+/// Used by <see cref="MapLoaderSystem"/> to track the original tile map from when a map was loaded.
+/// </summary>
+/// <remarks>
+/// <para>
+/// This component is used to reduce differences on map saving, by making it so that a tile map can be re-used between map saves even if internal engine IDs change.
+/// </para>
+/// <para>
+/// This component is created on every grid entity read during map load.
+/// This means loading a multi-grid map will create multiple of these components.
+/// When re-saving the map, the map loader will arbitrarily choose which available <see cref="MapSaveTileMapComponent"/>
+/// to use.
+/// </para>
+/// </remarks>
+[RegisterComponent, UnsavedComponent]
+internal sealed partial class MapSaveTileMapComponent : Component
+{
+    public Dictionary<int, string> TileMap = [];
+}

Robust.Server/GameStates/PvsSystem.ToSendSet.cs

@@ -48,7 +48,7 @@ internal sealed partial class PvsSystem
         // We add chunk-size here so that its consistent with the normal PVS range setting.
         // I.e., distance here is the Chebyshev distance to the centre of each chunk, but the normal pvs range only
         // required that the chunk be touching the box, not the centre.
-        var count = distance < (_lowLodDistance + ChunkSize) / 2
+        var count = distance <=  (_viewSize + ChunkSize) / 2
             ? chunk.Contents.Count
             : chunk.LodCounts[0];
 

Robust.Server/GameStates/PvsSystem.cs

@@ -62,12 +62,14 @@ internal sealed partial class PvsSystem : EntitySystem
     public bool CullingEnabled { get; private set; }
 
     /// <summary>
-    /// Size of the side of the view bounds square.
+    /// Size of the side of the view bounds square. Related to <see cref="CVars.NetMaxUpdateRange"/>
     /// </summary>
     private float _viewSize;
 
-    // see CVars.NetLowLodDistance
-    private float _lowLodDistance;
+    /// <summary>
+    /// Size of the side of the priority view bounds square. Related to <see cref="CVars.NetPvsPriorityRange"/>
+    /// </summary>
+    private float _priorityViewSize;
 
     /// <summary>
     /// Per-tick ack data to avoid re-allocating.
@@ -139,7 +141,7 @@ internal sealed partial class PvsSystem : EntitySystem
 
         Subs.CVar(_configManager, CVars.NetPVS, SetPvs, true);
         Subs.CVar(_configManager, CVars.NetMaxUpdateRange, OnViewsizeChanged, true);
-        Subs.CVar(_configManager, CVars.NetLowLodRange, OnLodChanged, true);
+        Subs.CVar(_configManager, CVars.NetPvsPriorityRange, OnPriorityRangeChanged, true);
         Subs.CVar(_configManager, CVars.NetForceAckThreshold, OnForceAckChanged, true);
         Subs.CVar(_configManager, CVars.NetPvsAsync, OnAsyncChanged, true);
         Subs.CVar(_configManager, CVars.NetPvsCompressLevel, ResetParallelism, true);
@@ -276,12 +278,13 @@ internal sealed partial class PvsSystem : EntitySystem
 
     private void OnViewsizeChanged(float value)
     {
-        _viewSize = value;
+        _viewSize = Math.Max(ChunkSize, value);
+        OnPriorityRangeChanged(_configManager.GetCVar(CVars.NetPvsPriorityRange));
     }
 
-    private void OnLodChanged(float value)
+    private void OnPriorityRangeChanged(float value)
     {
-        _lowLodDistance = Math.Clamp(value, ChunkSize, 100f);
+        _priorityViewSize = Math.Max(_viewSize, value);
     }
 
     private void OnForceAckChanged(int value)
@@ -387,7 +390,7 @@ internal sealed partial class PvsSystem : EntitySystem
 
     private (Vector2 worldPos, float range, EntityUid? map) CalcViewBounds(Entity<TransformComponent, EyeComponent?> eye)
     {
-        var size = Math.Max(eye.Comp2?.PvsSize ?? _viewSize, 1);
+        var size = Math.Max(eye.Comp2?.PvsSize ?? _priorityViewSize, 1);
         return (_transform.GetWorldPosition(eye.Comp1), size / 2f, eye.Comp1.MapUid);
     }
 

Robust.Server/Maps/MapChunkSerializer.cs

@@ -104,12 +104,16 @@ internal sealed class MapChunkSerializer : ITypeSerializer<MapChunk, MappingData
 
         root.Add("version", new ValueDataNode("6"));
 
-        gridNode.Value = SerializeTiles(value);
+        Dictionary<int, int>? tileWriteMap = null;
+        if (context is MapSerializationContext mapContext)
+            tileWriteMap = mapContext.TileWriteMap;
+
+        gridNode.Value = SerializeTiles(value, tileWriteMap);
 
         return root;
     }
 
-    private static string SerializeTiles(MapChunk chunk)
+    private static string SerializeTiles(MapChunk chunk, Dictionary<int, int>? tileWriteMap)
     {
         // number of bytes written per tile, because sizeof(Tile) is useless.
         const int structSize = 6;
@@ -125,7 +129,11 @@ internal sealed class MapChunkSerializer : ITypeSerializer<MapChunk, MappingData
                 for (ushort x = 0; x < chunk.ChunkSize; x++)
                 {
                     var tile = chunk.GetTile(x, y);
-                    writer.Write(tile.TypeId);
+                    var typeId = tile.TypeId;
+                    if (tileWriteMap != null)
+                        typeId = tileWriteMap[typeId];
+
+                    writer.Write(typeId);
                     writer.Write((byte)tile.Flags);
                     writer.Write(tile.Variant);
                 }

Robust.Server/Maps/MapLoadOptions.cs

@@ -53,5 +53,7 @@ namespace Robust.Server.Maps
         /// This should be set to false if you want to load a map file onto an existing map and do not wish to overwrite the existing entity.
         /// </remarks>
         public bool LoadMap { get; set; } = true;
+
+        public bool DoMapInit = false;
     }
 }

Robust.Server/ServerStatus/StatusHost.cs

@@ -256,7 +256,7 @@ namespace Robust.Server.ServerStatus
                 _context = context;
                 RequestMethod = new HttpMethod(context.Request.HttpMethod!);
 
-                var headers = new Dictionary<string, StringValues>();
+                var headers = new Dictionary<string, StringValues>(StringComparer.OrdinalIgnoreCase);
                 foreach (string? key in context.Request.Headers.Keys)
                 {
                     if (key == null)

Robust.Server/ServerStatus/WatchdogApi.cs

@@ -157,11 +157,14 @@ namespace Robust.Server.ServerStatus
             try
             {
                 // Passing null as content works so...
-                await _httpClient.PostAsync(new Uri(_baseUri, $"server_api/{_watchdogKey}/ping"), null!);
+                _sawmill.Debug("Sending ping to watchdog...");
+                using var resp = await _httpClient.PostAsync(new Uri(_baseUri, $"server_api/{_watchdogKey}/ping"), null!);
+                resp.EnsureSuccessStatusCode();
+                _sawmill.Debug("Succeeded in sending ping to watchdog");
             }
             catch (HttpRequestException e)
             {
-                _sawmill.Warning("Failed to send ping to watchdog:\n{0}", e);
+                _sawmill.Error("Failed to send ping to watchdog:\n{0}", e);
             }
         }
 

Robust.Shared.Maths/Color.cs

@@ -592,7 +592,11 @@ namespace Robust.Shared.Maths
             if (c != 0)
             {
                 if (max == rgb.R)
+                {
                     h = (rgb.G - rgb.B) / c % 6.0f;
+                    if (h < 0f)
+                        h += 6.0f;
+                }
                 else if (max == rgb.G)
                     h = (rgb.B - rgb.R) / c + 2.0f;
                 else if (max == rgb.B)
@@ -774,7 +778,11 @@ namespace Robust.Shared.Maths
 
             var h = 0.0f;
             if (max == rgb.R)
+            {
                 h = (rgb.G - rgb.B) / c % 6.0f;
+                if (h < 0f)
+                    h += 6.0f;
+            }
             else if (max == rgb.G)
                 h = (rgb.B - rgb.R) / c + 2.0f;
             else if (max == rgb.B)

Robust.Shared/Analyzers/AccessAttribute.cs

@@ -1,6 +1,6 @@
 using System;
 
-#if NETSTANDARD2_0
+#if ROBUST_ANALYZERS_IMPL
 namespace Robust.Shared.Analyzers.Implementation;
 #else
 namespace Robust.Shared.Analyzers;

Robust.Shared/Analyzers/AccessPermissions.cs

@@ -1,6 +1,6 @@
 using System;
 
-#if NETSTANDARD2_0
+#if ROBUST_ANALYZERS_IMPL
 namespace Robust.Shared.Analyzers.Implementation;
 #else
 namespace Robust.Shared.Analyzers;

Robust.Shared/Analyzers/NotNullableFlagAttribute.cs

@@ -1,6 +1,6 @@
 using System;
 
-#if NETSTANDARD2_0
+#if ROBUST_ANALYZERS_IMPL
 namespace Robust.Shared.Analyzers.Implementation;
 #else
 namespace Robust.Shared.Analyzers;

Robust.Shared/Analyzers/PreferGenericVariantAttribute.cs

@@ -1,6 +1,6 @@
 using System;
 
-#if NETSTANDARD2_0
+#if ROBUST_ANALYZERS_IMPL
 namespace Robust.Shared.Analyzers.Implementation;
 #else
 namespace Robust.Shared.Analyzers;

Robust.Shared/Audio/AudioMetadataPrototype.cs

@@ -10,7 +10,7 @@ namespace Robust.Shared.Audio;
 /// to allow the server to know audio lengths without shipping the large audio files themselves.
 /// </summary>
 [Prototype(ProtoName)]
-public sealed class AudioMetadataPrototype : IPrototype
+public sealed partial class AudioMetadataPrototype : IPrototype
 {
     public const string ProtoName = "audioMetadata";
 

Robust.Shared/Audio/AudioParams.cs

@@ -29,12 +29,6 @@ namespace Robust.Shared.Audio
     [DataDefinition]
     public partial struct AudioParams
     {
-        /// <summary>
-        ///     The DistanceModel to use for this specific source.
-        /// </summary>
-        [DataField]
-        public Attenuation Attenuation { get; set; } = Attenuation.LinearDistanceClamped;
-
         /// <summary>
         ///     Base volume to play the audio at, in dB.
         /// </summary>
@@ -45,13 +39,13 @@ namespace Robust.Shared.Audio
         ///     Scale for the audio pitch.
         /// </summary>
         [DataField]
-        public float Pitch { get; set; } = Default.Pitch;
+        public float Pitch
+        {
+            get => _pitch;
+            set => _pitch = MathF.Max(0f, value);
+        }
 
-        /// <summary>
-        ///     Audio bus to play on.
-        /// </summary>
-        [DataField]
-        public string BusName { get; set; } = Default.BusName;
+        private float _pitch = Default.Pitch;
 
         /// <summary>
         ///     Only applies to positional audio.
@@ -89,7 +83,7 @@ namespace Robust.Shared.Audio
         /// <summary>
         ///     The "default" audio configuration.
         /// </summary>
-        public static readonly AudioParams Default = new(0, 1, "Master", SharedAudioSystem.DefaultSoundRange, 1, 1, false, 0f);
+        public static readonly AudioParams Default = new(0, 1, SharedAudioSystem.DefaultSoundRange, 1, 1, false, 0f);
 
         // explicit parameterless constructor required so that default values get set properly.
         public AudioParams() { }
@@ -97,21 +91,19 @@ namespace Robust.Shared.Audio
         public AudioParams(
             float volume,
             float pitch,
-            string busName,
             float maxDistance,
             float refDistance,
             bool loop,
             float playOffsetSeconds,
             float? variation = null)
-            : this(volume, pitch, busName, maxDistance, 1, refDistance, loop, playOffsetSeconds, variation)
+            : this(volume, pitch, maxDistance, 1, refDistance, loop, playOffsetSeconds, variation)
         {
         }
 
-        public AudioParams(float volume, float pitch, string busName, float maxDistance,float rolloffFactor, float refDistance, bool loop, float playOffsetSeconds, float? variation = null) : this()
+        public AudioParams(float volume, float pitch, float maxDistance,float rolloffFactor, float refDistance, bool loop, float playOffsetSeconds, float? variation = null) : this()
         {
             Volume = volume;
             Pitch = pitch;
-            BusName = busName;
             MaxDistance = maxDistance;
             RolloffFactor = rolloffFactor;
             ReferenceDistance = refDistance;
@@ -167,18 +159,6 @@ namespace Robust.Shared.Audio
             return me;
         }
 
-        /// <summary>
-        ///     Returns a copy of this instance with a new bus name set, for easy chaining.
-        /// </summary>
-        /// <param name="bus">The new bus name.</param>
-        [Pure]
-        public readonly AudioParams WithBusName(string bus)
-        {
-            var me = this;
-            me.BusName = bus;
-            return me;
-        }
-
         /// <summary>
         ///     Returns a copy of this instance with a new max distance set, for easy chaining.
         /// </summary>
@@ -227,18 +207,6 @@ namespace Robust.Shared.Audio
             return me;
         }
 
-        /// <summary>
-        ///     Returns a copy of this instance with attenuation set, for easy chaining.
-        /// </summary>
-        /// <param name="attenuation">The new attenuation.</param>
-        [Pure]
-        public readonly AudioParams WithAttenuation(Attenuation attenuation)
-        {
-            var me = this;
-            me.Attenuation = attenuation;
-            return me;
-        }
-
         [Pure]
         public readonly AudioParams WithPlayOffset(float offset)
         {

Robust.Shared/Audio/AudioPresetPrototype.cs

@@ -9,7 +9,7 @@ namespace Robust.Shared.Audio;
 /// This can be used by <see cref="Content.Shared.Audio.SharedContentAudioSystem"/> to apply an audio preset.
 /// </summary>
 [Prototype("audioPreset")]
-public sealed class AudioPresetPrototype : IPrototype
+public sealed partial class AudioPresetPrototype : IPrototype
 {
     [IdDataField]
     public string ID { get; } = default!;

Robust.Shared/Audio/Components/AudioComponent.cs

@@ -6,6 +6,7 @@ using Robust.Shared.Audio.Sources;
 using Robust.Shared.Audio.Systems;
 using Robust.Shared.GameObjects;
 using Robust.Shared.GameStates;
+using Robust.Shared.Serialization;
 using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
 using Robust.Shared.ViewVariables;
@@ -90,11 +91,24 @@ public sealed partial class AudioComponent : Component, IAudioSource
     public void StartPlaying() => Source.StartPlaying();
 
     /// <inheritdoc />
-    public void StopPlaying() => Source.StopPlaying();
+    public void StopPlaying()
+    {
+        PlaybackPosition = 0f;
+        Source.StopPlaying();
+    }
 
     /// <inheritdoc />
     public void Restart() => Source.Restart();
 
+    [DataField, AutoNetworkedField]
+    public AudioState State = AudioState.Playing;
+
+    /// <summary>
+    /// Time when the audio was paused so we can offset it later if relevant.
+    /// </summary>
+    [DataField, AutoNetworkedField]
+    public TimeSpan? PauseTime;
+
     /// <summary>
     /// <see cref="IAudioSource.Playing"/>
     /// </summary>
@@ -208,6 +222,7 @@ public sealed partial class AudioComponent : Component, IAudioSource
     /// <see cref="IAudioSource.PlaybackPosition"/>
     /// </summary>
     [ViewVariables]
+    [Access(Other = AccessPermissions.ReadWriteExecute)]
     public float PlaybackPosition
     {
         get => Source.PlaybackPosition;
@@ -240,6 +255,14 @@ public sealed partial class AudioComponent : Component, IAudioSource
     }
 }
 
+[Serializable, NetSerializable]
+public enum AudioState : byte
+{
+    Stopped,
+    Playing,
+    Paused,
+}
+
 [Flags]
 public enum AudioFlags : byte
 {

Robust.Shared/Audio/SoundCollectionPrototype.cs

@@ -1,13 +1,13 @@
+using System.Collections.Generic;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.Utility;
 using Robust.Shared.ViewVariables;
-using System.Collections.Generic;
 
 namespace Robust.Shared.Audio;
 
 [Prototype("soundCollection")]
-public sealed class SoundCollectionPrototype : IPrototype
+public sealed partial class SoundCollectionPrototype : IPrototype
 {
     [ViewVariables]
     [IdDataField]

Robust.Shared/Audio/Systems/SharedAudioSystem.cs

@@ -55,6 +55,141 @@ public abstract partial class SharedAudioSystem : EntitySystem
         SubscribeLocalEvent<AudioComponent, EntityUnpausedEvent>(OnAudioUnpaused);
     }
 
+    /// <summary>
+    /// Sets the playback position of audio to the specified spot.
+    /// </summary>
+    public void SetPlaybackPosition(Entity<AudioComponent?>? nullEntity, float position)
+    {
+        if (nullEntity == null)
+            return;
+
+        var entity = nullEntity.Value;
+
+        if (!Resolve(entity.Owner, ref entity.Comp, false))
+            return;
+
+        var audioLength = GetAudioLength(entity.Comp.FileName);
+
+        if (audioLength.TotalSeconds < position)
+        {
+            // Just stop it and return
+            if (!_netManager.IsClient)
+                QueueDel(nullEntity.Value);
+
+            entity.Comp.StopPlaying();
+            return;
+        }
+
+        if (position < 0f)
+        {
+            Log.Error($"Tried to set playback position for {ToPrettyString(entity.Owner)} / {entity.Comp.FileName} outside of bounds");
+            return;
+        }
+
+        // If we're paused then the current position is <pause time - start time>, else it's <cur time - start time>
+        var currentPos = (entity.Comp.PauseTime ?? Timing.CurTime) - entity.Comp.AudioStart;
+        var timeOffset = TimeSpan.FromSeconds(position - currentPos.TotalSeconds);
+
+        DebugTools.Assert(currentPos > TimeSpan.Zero);
+
+        // Rounding.
+        if (Math.Abs(timeOffset.TotalSeconds) <= 0.01)
+        {
+            return;
+        }
+
+        if (entity.Comp.PauseTime != null)
+        {
+            entity.Comp.PauseTime = entity.Comp.PauseTime.Value + timeOffset;
+
+            // Paused audio doesn't have TimedDespawn so.
+        }
+        else
+        {
+            // Bump it back so the actual playback positions moves forward
+            entity.Comp.AudioStart -= timeOffset;
+
+            // need to ensure it doesn't despawn too early.
+            if (TryComp(entity.Owner, out TimedDespawnComponent? despawn))
+            {
+                despawn.Lifetime -= (float) timeOffset.TotalSeconds;
+            }
+        }
+
+        entity.Comp.PlaybackPosition = position;
+        // Network the new playback position.
+        Dirty(entity);
+    }
+
+    /// <summary>
+    /// Calculates playback position considering length paused.
+    /// </summary>
+    /// <param name="component"></param>
+    /// <returns></returns>
+    private float GetPlaybackPosition(AudioComponent component)
+    {
+        return (float) (Timing.CurTime - (component.PauseTime ?? TimeSpan.Zero) - component.AudioStart).TotalSeconds;
+    }
+
+    /// <summary>
+    /// Sets the shared state for an audio entity.
+    /// </summary>
+    public void SetState(EntityUid? entity, AudioState state, bool force = false, AudioComponent? component = null)
+    {
+        if (entity == null || !Resolve(entity.Value, ref component, false))
+            return;
+
+        if (component.State == state && !force)
+            return;
+
+        // Unpause it
+        if (component.State == AudioState.Paused && state == AudioState.Playing)
+        {
+            var pauseOffset = Timing.CurTime - component.PauseTime;
+            component.AudioStart += pauseOffset ?? TimeSpan.Zero;
+            component.PlaybackPosition = (float) (Timing.CurTime - component.AudioStart).TotalSeconds;
+        }
+
+        // If we were stopped then played then restart audiostart to now.
+        if (component.State == AudioState.Stopped && state == AudioState.Playing)
+        {
+            component.AudioStart = Timing.CurTime;
+            component.PauseTime = null;
+        }
+
+        switch (state)
+        {
+            case AudioState.Stopped:
+                component.AudioStart = Timing.CurTime;
+                component.PauseTime = null;
+                component.StopPlaying();
+                RemComp<TimedDespawnComponent>(entity.Value);
+                break;
+            case AudioState.Paused:
+                // Set it to current time so we can easily unpause it later.
+                component.PauseTime = Timing.CurTime;
+                component.Pause();
+                RemComp<TimedDespawnComponent>(entity.Value);
+                break;
+            case AudioState.Playing:
+                component.PauseTime = null;
+                component.StartPlaying();
+
+                // Reset TimedDespawn so the audio still gets cleaned up.
+
+                if (!component.Looping)
+                {
+                    var timed = EnsureComp<TimedDespawnComponent>(entity.Value);
+                    var audioLength = GetAudioLength(component.FileName);
+                    timed.Lifetime = (float) audioLength.TotalSeconds + 0.01f;
+                }
+                break;
+        }
+
+        component.State = state;
+        Dirty(entity.Value, component);
+    }
+
     protected void SetZOffset(float value)
     {
         ZOffset = value;
@@ -505,4 +640,12 @@ public abstract partial class SharedAudioSystem : EntitySystem
     {
         public NetEntity NetEntity;
     }
+
+    public bool IsPlaying(EntityUid? stream, AudioComponent? component = null)
+    {
+        if (stream == null || !Resolve(stream.Value, ref component, false))
+            return false;
+
+        return component.State == AudioState.Playing;
+    }
 }

Robust.Shared/CVars.cs

@@ -225,18 +225,24 @@ namespace Robust.Shared
             CVarDef.Create("net.pvs_async", true, CVar.ARCHIVE | CVar.SERVERONLY);
 
         /// <summary>
-        /// View size to take for PVS calculations,
-        /// as the size of the sides of a square centered on the view points of clients.
+        /// View size to take for PVS calculations, as the size of the sides of a square centered on the view points of
+        /// clients. See also <see cref="NetPvsPriorityRange"/>.
         /// </summary>
         public static readonly CVarDef<float> NetMaxUpdateRange =
             CVarDef.Create("net.pvs_range", 25f, CVar.ARCHIVE | CVar.REPLICATED | CVar.SERVER);
 
         /// <summary>
-        /// Chunks whose centre is further than this distance away from a player's eye will contain fewer entities.
-        /// This has no effect if it is smaller than <see cref="NetMaxUpdateRange"/>
+        /// A variant of <see cref="NetMaxUpdateRange"/> that is used to limit the view-distance of entities with the
+        /// <see cref="MetaDataFlags.PvsPriority"/> flag set. This can be used to extend the range at which certain
+        /// entities become visible.
         /// </summary>
-        public static readonly CVarDef<float> NetLowLodRange =
-            CVarDef.Create("net.low_lod_distance", 100f, CVar.ARCHIVE | CVar.REPLICATED | CVar.SERVER);
+        /// <remarks>
+        /// This is useful for entities like lights and occluders to try and prevent noticeable pop-in as players
+        /// move around. Note that this has no effect if it is less than <see cref="NetMaxUpdateRange"/>, and that this
+        /// only works for entities that are directly parented to a grid or map.
+        /// </remarks>
+        public static readonly CVarDef<float> NetPvsPriorityRange =
+            CVarDef.Create("net.pvs_priority_range", 32.5f, CVar.ARCHIVE | CVar.REPLICATED | CVar.SERVER);
 
         /// <summary>
         /// Maximum allowed delay between the current tick and a client's last acknowledged tick before we send the
@@ -845,7 +851,7 @@ namespace Robust.Shared
         /// See the documentation of the <see cref="Network.AuthMode"/> enum for values.
         /// </summary>
         public static readonly CVarDef<int> AuthMode =
-            CVarDef.Create("auth.mode", (int) Network.AuthMode.Optional, CVar.SERVERONLY);
+            CVarDef.Create("auth.mode", (int) Network.AuthMode.Required, CVar.SERVERONLY);
 
         /// <summary>
         /// Allow unauthenticated localhost connections, even if the auth mode is set to required.
@@ -880,6 +886,22 @@ namespace Robust.Shared
         public static readonly CVarDef<string> RenderFOVColor =
             CVarDef.Create("render.fov_color", Color.Black.ToHex(), CVar.ARCHIVE | CVar.CLIENTONLY);
 
+        /*
+         *  CONTROLS
+         */
+
+        /// <summary>
+        /// Milliseconds to wait to consider double-click delays.
+        /// </summary>
+        public static readonly CVarDef<int> DoubleClickDelay =
+            CVarDef.Create("controls.double_click_delay", 250, CVar.ARCHIVE | CVar.CLIENTONLY);
+
+        /// <summary>
+        /// Range in pixels for double-clicks
+        /// </summary>
+        public static readonly CVarDef<int> DoubleClickRange =
+            CVarDef.Create("controls.double_click_range", 10, CVar.ARCHIVE | CVar.CLIENTONLY);
+
         /*
          * DISPLAY
          */
@@ -1423,7 +1445,7 @@ namespace Robust.Shared
         /// Comma-separated list of URLs of hub servers to advertise to.
         /// </summary>
         public static readonly CVarDef<string> HubUrls =
-            CVarDef.Create("hub.hub_urls", "https://central.spacestation14.io/hub/", CVar.SERVERONLY);
+            CVarDef.Create("hub.hub_urls", "https://hub.spacestation14.com/", CVar.SERVERONLY);
 
         /// <summary>
         /// URL of this server to advertise.

Robust.Shared/Configuration/ConfigurationManager.cs

@@ -558,17 +558,21 @@ namespace Robust.Shared.Configuration
             OverrideDefault(def.Name, value);
         }
 
-        /// <inheritdoc />
-        public T GetCVar<T>(string name)
+        public object GetCVar(string name)
         {
             using var _ = Lock.ReadGuard();
             if (_configVars.TryGetValue(name, out var cVar) && cVar.Registered)
-                //TODO: Make flags work, required non-derpy net system.
-                return (T)(GetConfigVarValue(cVar))!;
+                return GetConfigVarValue(cVar);
 
             throw new InvalidConfigurationException($"Trying to get unregistered variable '{name}'");
         }
 
+        /// <inheritdoc />
+        public T GetCVar<T>(string name)
+        {
+            return (T)GetCVar(name);
+        }
+
         public T GetCVar<T>(CVarDef<T> def) where T : notnull
         {
             return GetCVar<T>(def.Name);

Robust.Shared/Configuration/EnvironmentVariables.cs

@@ -1,9 +1,10 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 
 namespace Robust.Shared.Configuration
 {
-    public static class EnvironmentVariables
+    internal static class EnvironmentVariables
     {
         /// <summary>
         /// The environment variable for configuring CVar overrides. The value
@@ -12,23 +13,38 @@ namespace Robust.Shared.Configuration
         /// </summary>
         public const string ConfigVarEnvironmentVariable = "ROBUST_CVARS";
 
+        public const string SingleVarPrefix = "ROBUST_CVAR_";
+
         /// <summary>
         /// Get the CVar overrides defined in the relevant environment variable.
         /// </summary>
-        public static IEnumerable<(string, string)> GetEnvironmentCVars()
+        internal static IEnumerable<(string, string)> GetEnvironmentCVars()
         {
-            var eVarString = Environment.GetEnvironmentVariable(ConfigVarEnvironmentVariable);
-
-            if (eVarString == null)
-            {
-                yield break;
-            }
+            // Handle ROBUST_CVARS.
+            var eVarString = Environment.GetEnvironmentVariable(ConfigVarEnvironmentVariable) ?? "";
 
             foreach (var cVarPair in eVarString.Split(';', StringSplitOptions.RemoveEmptyEntries))
             {
                 var pairParts = cVarPair.Split('=', 2);
                 yield return (pairParts[0], pairParts[1]);
             }
+
+            // Handle ROBUST_CVAR_*
+
+            foreach (DictionaryEntry entry in Environment.GetEnvironmentVariables())
+            {
+                var key = (string)entry.Key;
+                var value = (string?)entry.Value;
+
+                if (value == null)
+                    continue;
+
+                if (!key.StartsWith(SingleVarPrefix))
+                    continue;
+
+                var varName = key[SingleVarPrefix.Length..].Replace("__", ".");
+                yield return (varName, value);
+            }
         }
     }
 }

Robust.Shared/Configuration/IConfigurationManager.cs

@@ -118,6 +118,13 @@ namespace Robust.Shared.Configuration
         /// <param name="value">The new default value of the CVar.</param>
         void OverrideDefault<T>(CVarDef<T> def, T value) where T : notnull;
 
+        /// <summary>
+        /// Get the value of a CVar.
+        /// </summary>
+        /// <param name="name">The name of the CVar.</param>
+        /// <returns></returns>
+        object GetCVar(string name);
+
         /// <summary>
         /// Get the value of a CVar.
         /// </summary>

Robust.Shared/Console/Commands/MapCommands.cs

@@ -10,7 +10,8 @@ namespace Robust.Shared.Console.Commands;
 
 sealed class AddMapCommand : LocalizedCommands
 {
-    [Dependency] private readonly IMapManager _map = default!;
+    [Dependency] private readonly IMapManagerInternal _map = default!;
+    [Dependency] private readonly IEntityManager _entMan = default!;
 
     public override string Command => "addmap";
     public override bool RequireServerOrSingleplayer => true;
@@ -24,11 +25,8 @@ sealed class AddMapCommand : LocalizedCommands
 
         if (!_map.MapExists(mapId))
         {
-            _map.CreateMap(mapId);
-            if (args.Length >= 2 && args[1] == "false")
-            {
-                _map.AddUninitializedMap(mapId);
-            }
+            var init = args.Length < 2 || !bool.Parse(args[1]);
+            _entMan.System<SharedMapSystem>().CreateMap(mapId, runMapInit: init);
 
             shell.WriteLine($"Map with ID {mapId} created.");
             return;

Robust.Shared/Containers/SharedContainerSystem.Insert.cs

@@ -135,6 +135,25 @@ public abstract partial class SharedContainerSystem
         return true;
     }
 
+    /// <summary>
+    /// Attempts to insert an entity into a container. If it fails, it will instead drop the entity next to the
+    /// container entity.
+    /// </summary>
+    /// <returns>Whether or not the entity was successfully inserted</returns>
+    public bool InsertOrDrop(Entity<TransformComponent?, MetaDataComponent?, PhysicsComponent?> toInsert,
+        BaseContainer container,
+        TransformComponent? containerXform = null)
+    {
+        if (!Resolve(toInsert.Owner, ref toInsert.Comp1) || !Resolve(container.Owner, ref containerXform))
+            return false;
+
+        if (Insert(toInsert, container, containerXform))
+            return true;
+
+        _transform.DropNextTo(toInsert, (container.Owner, containerXform));
+        return false;
+    }
+
     /// <summary>
     /// Checks if the entity can be inserted into the given container.
     /// </summary>

Robust.Shared/Containers/SharedContainerSystem.cs

@@ -168,9 +168,16 @@ namespace Robust.Shared.Containers
             return containerManager.Containers.TryGetValue(id, out container);
         }
 
-        public bool TryGetContainingContainer(EntityUid uid, EntityUid containedUid, [NotNullWhen(true)] out BaseContainer? container, ContainerManagerComponent? containerManager = null, bool skipExistCheck = false)
+        [Obsolete("Use variant without skipExistCheck argument")]
+        public bool TryGetContainingContainer(EntityUid uid, EntityUid containedUid, [NotNullWhen(true)] out BaseContainer? container, bool skipExistCheck)
         {
-            if (!Resolve(uid, ref containerManager, false) || !(skipExistCheck || Exists(containedUid)))
+            return TryGetContainingContainer(uid, containedUid, out container);
+        }
+
+        public bool TryGetContainingContainer(EntityUid uid, EntityUid containedUid, [NotNullWhen(true)] out BaseContainer? container, ContainerManagerComponent? containerManager = null)
+        {
+            DebugTools.Assert(Exists(containedUid));
+            if (!Resolve(uid, ref containerManager, false))
             {
                 container = null;
                 return false;
@@ -191,7 +198,8 @@ namespace Robust.Shared.Containers
 
         public bool ContainsEntity(EntityUid uid, EntityUid containedUid, ContainerManagerComponent? containerManager = null)
         {
-            if (!Resolve(uid, ref containerManager, false) || !Exists(containedUid))
+            DebugTools.Assert(Exists(containedUid));
+            if (!Resolve(uid, ref containerManager, false))
                 return false;
 
             foreach (var container in containerManager.Containers.Values)
@@ -251,7 +259,7 @@ namespace Robust.Shared.Containers
             if (!Resolve(uid, ref transform, false))
                 return false;
 
-            return TryGetContainingContainer(transform.ParentUid, uid, out container, skipExistCheck: true);
+            return TryGetContainingContainer(transform.ParentUid, uid, out container);
         }
 
         /// <summary>

Robust.Shared/ContentPack/AssemblyTypeChecker.Parsing.cs

@@ -32,7 +32,7 @@ namespace Robust.Shared.ContentPack
             String("short").ThenReturn(PrimitiveTypeCode.Int16);
 
         private static readonly Parser<char, PrimitiveTypeCode> UInt16TypeParser =
-            String("ushort").ThenReturn(PrimitiveTypeCode.UInt32);
+            String("ushort").ThenReturn(PrimitiveTypeCode.UInt16);
 
         private static readonly Parser<char, PrimitiveTypeCode> Int32TypeParser =
             String("int").ThenReturn(PrimitiveTypeCode.Int32);

Robust.Shared/ContentPack/Sandbox.yml

@@ -84,12 +84,146 @@ Types:
       - "bool get_HasContents()"
   Lidgren.Network:
     NetBuffer:
-      All: True
+      Methods:
+      - "byte[] get_Data()"
+      - "void set_Data(byte[])"
+      - "int get_LengthBytes()"
+      - "void set_LengthBytes(int)"
+      - "int get_LengthBits()"
+      - "void set_LengthBits(int)"
+      - "long get_Position()"
+      - "void set_Position(long)"
+      - "int get_PositionInBytes()"
+      - "byte[] PeekDataBuffer()"
+      - "bool PeekBoolean()"
+      - "byte PeekByte()"
+      - "sbyte PeekSByte()"
+      - "byte PeekByte(int)"
+      - "System.Span`1<byte> PeekBytes(System.Span`1<byte>)"
+      - "byte[] PeekBytes(int)"
+      - "void PeekBytes(byte[], int, int)"
+      - "short PeekInt16()"
+      - "ushort PeekUInt16()"
+      - "int PeekInt32()"
+      - "int PeekInt32(int)"
+      - "uint PeekUInt32()"
+      - "uint PeekUInt32(int)"
+      - "ulong PeekUInt64()"
+      - "long PeekInt64()"
+      - "ulong PeekUInt64(int)"
+      - "long PeekInt64(int)"
+      - "float PeekFloat()"
+      - "System.Half PeekHalf()"
+      - "float PeekSingle()"
+      - "double PeekDouble()"
+      - "string PeekString()"
+      - "int PeekStringSize()"
+      - "bool ReadBoolean()"
+      - "byte ReadByte()"
+      - "bool ReadByte(ref byte)"
+      - "sbyte ReadSByte()"
+      - "byte ReadByte(int)"
+      - "System.Span`1<byte> ReadBytes(System.Span`1<byte>)"
+      - "byte[] ReadBytes(int)"
+      - "bool ReadBytes(int, ref byte[])"
+      - "bool TryReadBytes(System.Span`1<byte>)"
+      - "void ReadBytes(byte[], int, int)"
+      - "void ReadBits(System.Span`1<byte>, int)"
+      - "void ReadBits(byte[], int, int)"
+      - "short ReadInt16()"
+      - "ushort ReadUInt16()"
+      - "int ReadInt32()"
+      - "bool ReadInt32(ref int)"
+      - "int ReadInt32(int)"
+      - "uint ReadUInt32()"
+      - "bool ReadUInt32(ref uint)"
+      - "uint ReadUInt32(int)"
+      - "ulong ReadUInt64()"
+      - "long ReadInt64()"
+      - "ulong ReadUInt64(int)"
+      - "long ReadInt64(int)"
+      - "float ReadFloat()"
+      - "System.Half ReadHalf()"
+      - "float ReadSingle()"
+      - "bool ReadSingle(ref float)"
+      - "double ReadDouble()"
+      - "uint ReadVariableUInt32()"
+      - "bool ReadVariableUInt32(ref uint)"
+      - "int ReadVariableInt32()"
+      - "long ReadVariableInt64()"
+      - "ulong ReadVariableUInt64()"
+      - "float ReadSignedSingle(int)"
+      - "float ReadUnitSingle(int)"
+      - "float ReadRangedSingle(float, float, int)"
+      - "int ReadRangedInteger(int, int)"
+      - "long ReadRangedInteger(long, long)"
+      - "string ReadString()"
+      - "bool ReadString(ref string)"
+      - "double ReadTime(Lidgren.Network.NetConnection, bool)"
+      - "System.Net.IPEndPoint ReadIPEndPoint()"
+      - "void SkipPadBits()"
+      - "void ReadPadBits()"
+      - "void SkipPadBits(int)"
+      - "void EnsureBufferSize(int)"
+      - "void Write(bool)"
+      - "void Write(byte)"
+      - "void WriteAt(int, byte)"
+      - "void Write(sbyte)"
+      - "void Write(byte, int)"
+      - "void Write(byte[])"
+      - "void Write(System.ReadOnlySpan`1<byte>)"
+      - "void Write(byte[], int, int)"
+      - "void Write(ushort)"
+      - "void WriteAt(int, ushort)"
+      - "void Write(ushort, int)"
+      - "void Write(short)"
+      - "void WriteAt(int, short)"
+      - "void Write(int)"
+      - "void WriteAt(int, int)"
+      - "void Write(uint)"
+      - "void WriteAt(int, uint)"
+      - "void Write(uint, int)"
+      - "void Write(int, int)"
+      - "void Write(ulong)"
+      - "void WriteAt(int, ulong)"
+      - "void Write(ulong, int)"
+      - "void Write(long)"
+      - "void Write(long, int)"
+      - "void Write(System.Half)"
+      - "void Write(float)"
+      - "void Write(double)"
+      - "int WriteVariableUInt32(uint)"
+      - "int WriteVariableInt32(int)"
+      - "int WriteVariableInt64(long)"
+      - "int WriteVariableUInt64(ulong)"
+      - "void WriteSignedSingle(float, int)"
+      - "void WriteUnitSingle(float, int)"
+      - "void WriteRangedSingle(float, float, float, int)"
+      - "int WriteRangedInteger(int, int, int)"
+      - "int WriteRangedInteger(long, long, long)"
+      - "void Write(string)"
+      - "void Write(System.Net.IPEndPoint)"
+      - "void WriteTime(bool)"
+      - "void WriteTime(double, bool)"
+      - "void WritePadBits()"
+      - "void WritePadBits(int)"
+      - "void Write(Lidgren.Network.NetBuffer)"
+      - "void Zero(int)"
+      - "void .ctor()"
     NetDeliveryMethod: { }
     NetIncomingMessage:
-      All: True
+      Methods:
+      - "Lidgren.Network.NetIncomingMessageType get_MessageType()"
+      - "Lidgren.Network.NetDeliveryMethod get_DeliveryMethod()"
+      - "int get_SequenceChannel()"
+      - "System.Net.IPEndPoint get_SenderEndPoint()"
+      - "Lidgren.Network.NetConnection get_SenderConnection()"
+      - "double get_ReceiveTime()"
+      - "double ReadTime(bool)"
+      - "string ToString()"
     NetOutgoingMessage:
-      All: True
+      Methods:
+      - "string ToString()"
   Nett:
     CommentLocation: { } # Enum
     Toml:
@@ -951,7 +1085,9 @@ Types:
     IComparable: { All: True }
     IComparable`1: { All: True }
     IDisposable: { All: True }
-    IEquatable`1: { }
+    IEquatable`1:
+      Methods:
+      - "bool Equals(!0)"
     IFormatProvider: { All: True }
     IFormattable: { All: True }
     Index: { All: True }

Robust.Shared/ContentPack/WritableDirProvider.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
+using System.Threading;
 using Robust.Shared.Utility;
 
 namespace Robust.Shared.ContentPack
@@ -135,11 +136,37 @@ namespace Robust.Shared.ContentPack
                 path = path.Directory;
 
             var fullPath = GetFullPath(path);
-            Process.Start(new ProcessStartInfo
+            if (OperatingSystem.IsWindows())
             {
-                UseShellExecute = true,
-                FileName = fullPath,
-            });
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = "explorer.exe",
+                    Arguments = ".",
+                    WorkingDirectory = fullPath,
+                });
+            }
+            else if (OperatingSystem.IsMacOS())
+            {
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = "open",
+                    Arguments = ".",
+                    WorkingDirectory = fullPath,
+                });
+            }
+            else if (OperatingSystem.IsLinux() || OperatingSystem.IsFreeBSD())
+            {
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = "xdg-open",
+                    Arguments = ".",
+                    WorkingDirectory = fullPath,
+                });
+            }
+            else
+            {
+                throw new NotSupportedException("Opening OS windows not supported on this OS");
+            }
         }
 
         #endregion

Robust.Shared/GameObjects/ComponentAttributes.cs

@@ -0,0 +1,28 @@
+using System;
+using JetBrains.Annotations;
+
+namespace Robust.Shared.GameObjects;
+
+/// <summary>
+///     Marks a component as being automatically registered by <see cref="IComponentFactory.DoAutoRegistrations" />
+/// </summary>
+[AttributeUsage(AttributeTargets.Class, Inherited = false)]
+[BaseTypeRequired(typeof(IComponent))]
+[MeansImplicitUse]
+public sealed class RegisterComponentAttribute : Attribute;
+
+/// <summary>
+/// Defines Name that this component is represented with in prototypes.
+/// </summary>
+[AttributeUsage(AttributeTargets.Class)]
+public sealed class ComponentProtoNameAttribute(string prototypeName) : Attribute
+{
+    public string PrototypeName { get; } = prototypeName;
+}
+
+/// <summary>
+/// Marks a component as not being saved when saving maps/grids.
+/// </summary>
+/// <seealso cref="ComponentRegistration.Unsaved"/>
+[AttributeUsage(AttributeTargets.Class, Inherited = false)]
+public sealed class UnsavedComponentAttribute : Attribute;

Robust.Shared/GameObjects/ComponentFactory.cs

@@ -121,9 +121,11 @@ namespace Robust.Shared.GameObjects
             if (!overwrite && lowerCaseNames.TryGetValue(lowerCaseName, out var prevName))
                 throw new InvalidOperationException($"{lowerCaseName} is already registered, previous: {prevName}");
 
+            var unsaved = type.HasCustomAttribute<UnsavedComponentAttribute>();
+
             var idx = CompIdx.Index(type);
 
-            var registration = new ComponentRegistration(name, type, idx);
+            var registration = new ComponentRegistration(name, type, idx, unsaved);
 
             idxToType[idx] = type;
             names[name] = registration;

Robust.Shared/GameObjects/ComponentProtoNameAttribute.cs

@@ -1,18 +0,0 @@
-using System;
-
-namespace Robust.Shared.GameObjects
-{
-    /// <summary>
-    /// Defines Name that this component is represented with in prototypes.
-    /// </summary>
-    [AttributeUsage(AttributeTargets.Class)]
-    public sealed class ComponentProtoNameAttribute : Attribute
-    {
-        public string PrototypeName { get; }
-
-        public ComponentProtoNameAttribute(string prototypeName)
-        {
-            PrototypeName = prototypeName;
-        }
-    }
-}

Robust.Shared/GameObjects/ComponentRegistration.cs

@@ -21,6 +21,12 @@ public sealed class ComponentRegistration
 
     public CompIdx Idx { get; }
 
+    /// <summary>
+    /// If this is true, the component will not be saved when saving a map/grid.
+    /// </summary>
+    /// <seealso cref="UnsavedComponentAttribute"/>
+    public bool Unsaved { get; }
+
     /// <summary>
     /// ID used to reference the component type across the network.
     /// If null, no network synchronization will be available for this component.
@@ -35,11 +41,12 @@ public sealed class ComponentRegistration
 
     // Internal for sandboxing.
     // Avoid content passing an instance of this to ComponentFactory to get any type they want instantiated.
-    internal ComponentRegistration(string name, Type type, CompIdx idx)
+    internal ComponentRegistration(string name, Type type, CompIdx idx, bool unsaved = false)
     {
         Name = name;
         Type = type;
         Idx = idx;
+        Unsaved = unsaved;
     }
 
     public override string ToString()

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

@@ -101,7 +101,6 @@ namespace Robust.Shared.GameObjects
         internal bool _mapIdInitialized;
         internal bool _gridInitialized;
 
-        // TODO: Cache this.
         /// <summary>
         ///     The EntityUid of the map which this object is on, if any.
         /// </summary>

Robust.Shared/GameObjects/EntityEventBus.Broadcast.cs

@@ -329,7 +329,7 @@ namespace Robust.Shared.GameObjects
             ref Unit unitRef,
             EventData subs)
         {
-            foreach (var handler in subs.BroadcastRegistrations)
+            foreach (var handler in subs.BroadcastRegistrations.Span)
             {
                 if ((handler.Mask & source) != 0)
                     handler.Handler(ref unitRef);

Robust.Shared/GameObjects/EntityEventBus.Ordering.cs

@@ -13,7 +13,7 @@ namespace Robust.Shared.GameObjects
             EventData sub,
             ref ValueList<OrderedEventDispatch> found)
         {
-            foreach (var handler in sub.BroadcastRegistrations)
+            foreach (var handler in sub.BroadcastRegistrations.Span)
             {
                 if ((handler.Mask & source) != 0)
                     found.Add(new OrderedEventDispatch(handler.Handler, handler.Order));
@@ -44,7 +44,7 @@ namespace Robust.Shared.GameObjects
         {
             found.Sort(OrderedEventDispatchComparer.Instance);
 
-            foreach (var (handler, _) in found)
+            foreach (var (handler, _) in found.Span)
             {
                 handler(ref eventArgs);
             }

Robust.Shared/GameObjects/EntityManager.Components.cs

@@ -11,6 +11,7 @@ using Robust.Shared.GameStates;
 using Robust.Shared.Log;
 using Robust.Shared.Physics.Components;
 using Robust.Shared.Player;
+using Robust.Shared.Prototypes;
 using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 #if EXCEPTION_TOLERANCE
@@ -176,6 +177,60 @@ namespace Robust.Shared.GameObjects
             }
         }
 
+        /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void AddComponents(EntityUid target, EntityPrototype prototype, bool removeExisting = true)
+        {
+            AddComponents(target, prototype.Components, removeExisting);
+        }
+
+        /// <inheritdoc />
+        public void AddComponents(EntityUid target, ComponentRegistry registry, bool removeExisting = true)
+        {
+            if (registry.Count == 0)
+                return;
+
+            var metadata = MetaQuery.GetComponent(target);
+
+            foreach (var (name, entry) in registry)
+            {
+                var reg = _componentFactory.GetRegistration(name);
+
+                if (HasComponent(target, reg.Type))
+                {
+                    if (!removeExisting)
+                        continue;
+
+                    RemoveComponent(target, reg.Type, metadata);
+                }
+
+                var comp = _componentFactory.GetComponent(reg);
+                _serManager.CopyTo(entry.Component, ref comp, notNullableOverride: true);
+                AddComponent(target, comp, metadata: metadata);
+            }
+        }
+
+        /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void RemoveComponents(EntityUid target, EntityPrototype prototype)
+        {
+            RemoveComponents(target, prototype.Components);
+        }
+
+        /// <inheritdoc />
+        public void RemoveComponents(EntityUid target, ComponentRegistry registry)
+        {
+            if (registry.Count == 0)
+                return;
+
+            var metadata = MetaQuery.GetComponent(target);
+
+            foreach (var entry in registry.Values)
+            {
+                RemoveComponent(target, entry.Component.GetType(), metadata);
+            }
+        }
+
         public IComponent AddComponent(EntityUid uid, ushort netId, MetaDataComponent? meta = null)
         {
             var newComponent = _componentFactory.GetComponent(netId);
@@ -958,6 +1013,11 @@ namespace Robust.Shared.GameObjects
             }
         }
 
+        /// <summary>
+        /// Internal variant of <see cref="GetComponents"/> that directly returns the actual component set.
+        /// </summary>
+        internal IReadOnlyCollection<IComponent> GetComponentsInternal(EntityUid uid) => _entCompIndex[uid];
+
         /// <inheritdoc />
         public int ComponentCount(EntityUid uid)
         {

Robust.Shared/GameObjects/EntityManager.Spawn.cs

@@ -5,16 +5,17 @@ using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
 using Robust.Shared.Containers;
+using Robust.Shared.Maths;
 
 namespace Robust.Shared.GameObjects;
 
 public partial class EntityManager
 {
-    // This method will soon be marked as obsolete.
+    // This method will soon(TM) be marked as obsolete.
     public EntityUid SpawnEntity(string? protoName, EntityCoordinates coordinates, ComponentRegistry? overrides = null)
         => SpawnAttachedTo(protoName, coordinates, overrides);
 
-    // This method will soon be marked as obsolete.
+    // This method will soon(TM) be marked as obsolete.
     public EntityUid SpawnEntity(string? protoName, MapCoordinates coordinates, ComponentRegistry? overrides = null)
         => Spawn(protoName, coordinates, overrides);
 
@@ -83,12 +84,16 @@ public partial class EntityManager
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public EntityUid Spawn(string? protoName = null, ComponentRegistry? overrides = null)
-        => Spawn(protoName, MapCoordinates.Nullspace, overrides);
-
-    public virtual EntityUid Spawn(string? protoName, MapCoordinates coordinates, ComponentRegistry? overrides = null)
+    public EntityUid Spawn(string? protoName = null, ComponentRegistry? overrides = null, bool doMapInit = true)
     {
-        var entity = CreateEntityUninitialized(protoName, coordinates, overrides);
+        var entity = CreateEntityUninitialized(protoName, MapCoordinates.Nullspace, overrides);
+        InitializeAndStartEntity(entity, doMapInit);
+        return entity;
+    }
+
+    public virtual EntityUid Spawn(string? protoName, MapCoordinates coordinates, ComponentRegistry? overrides = null, Angle rotation = default!)
+    {
+        var entity = CreateEntityUninitialized(protoName, coordinates, overrides, rotation);
         InitializeAndStartEntity(entity, coordinates.MapId);
         return entity;
     }
@@ -111,32 +116,19 @@ public partial class EntityManager
         if (!xform.ParentUid.IsValid())
             return false;
 
-        if (!MetaQuery.TryGetComponent(target, out var meta))
-            return false;
-
-        if ((meta.Flags & MetaDataFlags.InContainer) == 0)
+        if (!_containers.TryGetContainingContainer(target, out var container))
         {
-            uid = SpawnAttachedTo(protoName, xform.Coordinates, overrides);
+            uid = SpawnNextToOrDrop(protoName, target, xform, overrides);
             return true;
         }
 
-        if (!TryGetComponent(xform.ParentUid, out ContainerManagerComponent? containerComp))
-            return false;
-
-        foreach (var container in containerComp.Containers.Values)
-        {
-            if (!container.Contains(target))
-                continue;
-
-            uid = Spawn(protoName, overrides);
-            if (_containers.Insert(uid.Value, container))
-                return true;
-
-            DeleteEntity(uid.Value);
-            uid = null;
-            return false;
-        }
+        var doMapInit = _mapSystem.IsInitialized(xform.MapUid);
+        uid = Spawn(protoName, overrides, doMapInit);
+        if (_containers.Insert(uid.Value, container))
+            return true;
 
+        DeleteEntity(uid.Value);
+        uid = null;
         return false;
     }
 
@@ -155,7 +147,8 @@ public partial class EntityManager
         if (!containerComp.Containers.TryGetValue(containerId, out var container))
             return false;
 
-        uid = Spawn(protoName, overrides);
+        var doMapInit = _mapSystem.IsInitialized(TransformQuery.GetComponent(containerUid).MapUid);
+        uid = Spawn(protoName, overrides, doMapInit);
 
         if (_containers.Insert(uid.Value, container))
             return true;
@@ -171,7 +164,8 @@ public partial class EntityManager
         if (!xform.ParentUid.IsValid())
             return Spawn(protoName);
 
-        var uid = Spawn(protoName, overrides);
+        var doMapInit = _mapSystem.IsInitialized(xform.MapUid);
+        var uid = Spawn(protoName, overrides, doMapInit);
         _xforms.DropNextTo(uid, target);
         return uid;
     }
@@ -184,14 +178,28 @@ public partial class EntityManager
         ContainerManagerComponent? containerComp = null,
         ComponentRegistry? overrides = null)
     {
-        var uid = Spawn(protoName, overrides);
+        return SpawnInContainerOrDrop(protoName, containerUid, containerId, out _, xform, containerComp, overrides);
+    }
+
+    public EntityUid SpawnInContainerOrDrop(
+        string? protoName,
+        EntityUid containerUid,
+        string containerId,
+        out bool inserted,
+        TransformComponent? xform = null,
+        ContainerManagerComponent? containerComp = null,
+        ComponentRegistry? overrides = null)
+    {
+        inserted = true;
+        xform ??= TransformQuery.GetComponent(containerUid);
+        var doMapInit = _mapSystem.IsInitialized(xform.MapUid);
+        var uid = Spawn(protoName, overrides, doMapInit);
 
         if ((containerComp == null && !TryGetComponent(containerUid, out containerComp))
              || !containerComp.Containers.TryGetValue(containerId, out var container)
              || !_containers.Insert(uid, container))
         {
-
-            xform ??= TransformQuery.GetComponent(containerUid);
+            inserted = false;
             if (xform.ParentUid.IsValid())
                 _xforms.DropNextTo(uid, (containerUid, xform));
         }

Robust.Shared/GameObjects/EntityManager.cs

@@ -9,6 +9,7 @@ using Robust.Shared.GameStates;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Map.Components;
+using Robust.Shared.Maths;
 using Robust.Shared.Network;
 using Robust.Shared.Player;
 using Robust.Shared.Profiling;
@@ -297,14 +298,13 @@ namespace Robust.Shared.GameObjects
         }
 
         /// <inheritdoc />
-        public virtual EntityUid CreateEntityUninitialized(string? prototypeName, MapCoordinates coordinates, ComponentRegistry? overrides = null)
+        public virtual EntityUid CreateEntityUninitialized(string? prototypeName, MapCoordinates coordinates, ComponentRegistry? overrides = null, Angle rotation = default!)
         {
             var newEntity = CreateEntity(prototypeName, out _, overrides);
             var transform = TransformQuery.GetComponent(newEntity);
 
             if (coordinates.MapId == MapId.Nullspace)
             {
-                DebugTools.Assert(_mapManager.GetMapEntityId(coordinates.MapId) == EntityUid.Invalid);
                 transform._parent = EntityUid.Invalid;
                 transform.Anchored = false;
                 return newEntity;
@@ -323,7 +323,7 @@ namespace Robust.Shared.GameObjects
             else
             {
                 coords = new EntityCoordinates(mapEnt, coordinates.Position);
-                _xforms.SetCoordinates(newEntity, transform, coords, null, newParent: mapXform);
+                _xforms.SetCoordinates(newEntity, transform, coords, rotation, newParent: mapXform);
             }
 
             return newEntity;
@@ -821,15 +821,22 @@ namespace Robust.Shared.GameObjects
 
         public void InitializeAndStartEntity(EntityUid entity, MapId? mapId = null)
         {
+            var doMapInit = _mapManager.IsMapInitialized(mapId ?? TransformQuery.GetComponent(entity).MapID);
+            InitializeAndStartEntity(entity, doMapInit);
+        }
+
+        public void InitializeAndStartEntity(Entity<MetaDataComponent?> entity, bool doMapInit)
+        {
+            if (!MetaQuery.Resolve(entity.Owner, ref entity.Comp))
+                return;
+
             try
             {
-                var meta = MetaQuery.GetComponent(entity);
-                InitializeEntity(entity, meta);
-                StartEntity(entity);
+                InitializeEntity(entity.Owner, entity.Comp);
+                StartEntity(entity.Owner);
 
-                // If the map we're initializing the entity on is initialized, run map init on it.
-                if (_mapManager.IsMapInitialized(mapId ?? TransformQuery.GetComponent(entity).MapID))
-                    RunMapInit(entity, meta);
+                if (doMapInit)
+                    RunMapInit(entity.Owner, entity.Comp);
             }
             catch (Exception e)
             {
@@ -859,7 +866,7 @@ namespace Robust.Shared.GameObjects
             DebugTools.Assert(meta.EntityLifeStage == EntityLifeStage.Initialized, $"Expected entity {ToPrettyString(entity)} to be initialized, was {meta.EntityLifeStage}");
             SetLifeStage(meta, EntityLifeStage.MapInitialized);
 
-            EventBus.RaiseLocalEvent(entity, MapInitEventInstance, false);
+            EventBus.RaiseLocalEvent(entity, MapInitEventInstance);
         }
 
         /// <inheritdoc />

Robust.Shared/GameObjects/EntityManagerExt.cs

@@ -1,4 +1,7 @@
-namespace Robust.Shared.GameObjects
+using Robust.Shared.Collections;
+using Robust.Shared.Random;
+
+namespace Robust.Shared.GameObjects
 {
     public static class EntityManagerExt
     {
@@ -19,5 +22,79 @@
 
             return default;
         }
+
+        /// <summary>
+        /// Picks an entity at random with the supplied component.
+        /// </summary>
+        public static bool TryGetRandom<TComp1>(this IEntityManager entManager, IRobustRandom random, out EntityUid entity, bool includePaused = false) where TComp1 : IComponent
+        {
+            var entities = new ValueList<EntityUid>();
+
+            if (includePaused)
+            {
+                var query = entManager.AllEntityQueryEnumerator<TComp1>();
+
+                while (query.MoveNext(out var uid, out _))
+                {
+                    entities.Add(uid);
+                }
+            }
+            else
+            {
+                var query = entManager.EntityQueryEnumerator<TComp1>();
+
+                while (query.MoveNext(out var uid, out _))
+                {
+                    entities.Add(uid);
+                }
+            }
+
+            if (entities.Count == 0)
+            {
+                entity = EntityUid.Invalid;
+                return false;
+            }
+
+            entity = random.Pick(entities);
+            return true;
+        }
+
+        /// <summary>
+        /// Picks an entity at random with the supplied components.
+        /// </summary>
+        public static bool TryGetRandom<TComp1, TComp2>(this IEntityManager entManager, IRobustRandom random, out EntityUid entity, bool includePaused = false)
+            where TComp1 : IComponent
+            where TComp2 : IComponent
+        {
+            var entities = new ValueList<EntityUid>();
+
+            if (includePaused)
+            {
+                var query = entManager.AllEntityQueryEnumerator<TComp1, TComp2>();
+
+                while (query.MoveNext(out var uid, out _, out _))
+                {
+                    entities.Add(uid);
+                }
+            }
+            else
+            {
+                var query = entManager.EntityQueryEnumerator<TComp1, TComp2>();
+
+                while (query.MoveNext(out var uid, out _, out _))
+                {
+                    entities.Add(uid);
+                }
+            }
+
+            if (entities.Count == 0)
+            {
+                entity = EntityUid.Invalid;
+                return false;
+            }
+
+            entity = random.Pick(entities);
+            return true;
+        }
     }
 }

Robust.Shared/GameObjects/EntitySystem.Proxy.cs

@@ -5,8 +5,10 @@ using System.Runtime.CompilerServices;
 using JetBrains.Annotations;
 using Robust.Shared.Containers;
 using Robust.Shared.Map;
+using Robust.Shared.Maths;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Timing;
+using TerraFX.Interop.Windows;
 
 namespace Robust.Shared.GameObjects;
 
@@ -699,32 +701,32 @@ public partial class EntitySystem
 
     #region Entity Spawning
 
-    // This method will be obsoleted soon.
+    // This method will be obsoleted soon(TM).
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     protected EntityUid Spawn(string? prototype, EntityCoordinates coordinates)
     {
         return ((IEntityManager)EntityManager).SpawnEntity(prototype, coordinates);
     }
 
-    /// <inheritdoc cref="IEntityManager.Spawn(string?, MapCoordinates, ComponentRegistry?)" />
+    /// <inheritdoc cref="IEntityManager.Spawn(string?, MapCoordinates, ComponentRegistry?, Angle)" />
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    protected EntityUid Spawn(string? prototype, MapCoordinates coordinates)
-        => EntityManager.Spawn(prototype, coordinates);
+    protected EntityUid Spawn(string? prototype, MapCoordinates coordinates, ComponentRegistry? overrides = null, Angle rotation = default)
+        => EntityManager.Spawn(prototype, coordinates, overrides, rotation);
 
-    /// <inheritdoc cref="IEntityManager.Spawn(string?, ComponentRegistry?)" />
+    /// <inheritdoc cref="IEntityManager.Spawn(string?, ComponentRegistry?, bool)" />
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    protected EntityUid Spawn(string? prototype = null)
-        => EntityManager.Spawn(prototype);
+    protected EntityUid Spawn(string? prototype = null, ComponentRegistry? overrides = null, bool doMapInit = true)
+        => EntityManager.Spawn(prototype, overrides, doMapInit);
 
     /// <inheritdoc cref="IEntityManager.SpawnAttachedTo" />
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    protected EntityUid SpawnAttachedTo(string? prototype, EntityCoordinates coordinates)
-        => EntityManager.SpawnAttachedTo(prototype, coordinates);
+    protected EntityUid SpawnAttachedTo(string? prototype, EntityCoordinates coordinates, ComponentRegistry? overrides = null)
+        => EntityManager.SpawnAttachedTo(prototype, coordinates, overrides);
 
     /// <inheritdoc cref="IEntityManager.SpawnAtPosition" />
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    protected EntityUid SpawnAtPosition(string? prototype, EntityCoordinates coordinates)
-        => EntityManager.SpawnAtPosition(prototype, coordinates);
+    protected EntityUid SpawnAtPosition(string? prototype, EntityCoordinates coordinates, ComponentRegistry? overrides = null)
+        => EntityManager.SpawnAtPosition(prototype, coordinates, overrides);
 
     /// <inheritdoc cref="IEntityManager.TrySpawnInContainer" />
     [MethodImpl(MethodImplOptions.AggressiveInlining)]

Robust.Shared/GameObjects/IEntityManager.Components.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using Robust.Shared.Player;
+using Robust.Shared.Prototypes;
 using Robust.Shared.Timing;
 
 namespace Robust.Shared.GameObjects
@@ -38,6 +39,26 @@ namespace Robust.Shared.GameObjects
         /// </summary>
         int Count(Type component);
 
+        /// <summary>
+        /// Adds the specified components from the <see cref="EntityPrototype"/>
+        /// </summary>
+        void AddComponents(EntityUid target, EntityPrototype prototype, bool removeExisting = true);
+
+        /// <summary>
+        /// Adds the specified registry components to the target entity.
+        /// </summary>
+        void AddComponents(EntityUid target, ComponentRegistry registry, bool removeExisting = true);
+
+        /// <summary>
+        /// Removes the specified entity prototype components from the target entity.
+        /// </summary>
+        void RemoveComponents(EntityUid target, EntityPrototype prototype);
+
+        /// <summary>
+        /// Removes the specified registry components from the target entity.
+        /// </summary>
+        void RemoveComponents(EntityUid target, ComponentRegistry registry);
+
         /// <summary>
         ///     Adds a Component type to an entity. If the entity is already Initialized, the component will
         ///     automatically be Initialized and Started.

Robust.Shared/GameObjects/IEntityManager.Spawn.cs

@@ -2,6 +2,7 @@ using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using Robust.Shared.Containers;
 using Robust.Shared.Map;
+using Robust.Shared.Maths;
 using Robust.Shared.Prototypes;
 
 namespace Robust.Shared.GameObjects;
@@ -27,12 +28,12 @@ public partial interface IEntityManager
     /// <summary>
     /// Spawns an entity in nullspace.
     /// </summary>
-    EntityUid Spawn(string? protoName = null, ComponentRegistry? overrides = null);
+    EntityUid Spawn(string? protoName = null, ComponentRegistry? overrides = null, bool doMapInit = true);
 
     /// <summary>
     /// Spawns an entity at a specific world position. The entity will either be parented to the map or a grid.
     /// </summary>
-    EntityUid Spawn(string? protoName, MapCoordinates coordinates, ComponentRegistry? overrides = null);
+    EntityUid Spawn(string? protoName, MapCoordinates coordinates, ComponentRegistry? overrides = null, Angle rotation = default!);
 
     /// <summary>
     /// Spawns an entity and then parents it to the entity that the given entity coordinates are relative to.
@@ -46,7 +47,7 @@ public partial interface IEntityManager
     EntityUid SpawnAtPosition(string? protoName, EntityCoordinates coordinates, ComponentRegistry? overrides = null);
 
     /// <summary>
-    /// Attempts to spawn an entity inside of a container.
+    /// Attempt to spawn an entity and insert it into a container. If the insertion fails, the entity gets deleted.
     /// </summary>
     bool TrySpawnInContainer(
         string? protoName,
@@ -58,9 +59,9 @@ public partial interface IEntityManager
 
     /// <summary>
     /// Attempts to spawn an entity inside of a container. If it fails to insert into the container, it will
-    /// instead attempt to spawn the entity next to the target.
+    /// instead drop the entity next to the target (see <see cref="SpawnNextToOrDrop"/>).
     /// </summary>
-    public EntityUid SpawnInContainerOrDrop(
+    EntityUid SpawnInContainerOrDrop(
         string? protoName,
         EntityUid containerUid,
         string containerId,
@@ -68,9 +69,20 @@ public partial interface IEntityManager
         ContainerManagerComponent? containerComp = null,
         ComponentRegistry? overrides = null);
 
+    /// <inheritdoc cref="SpawnInContainerOrDrop(string?,Robust.Shared.GameObjects.EntityUid,string,Robust.Shared.GameObjects.TransformComponent?,Robust.Shared.Containers.ContainerManagerComponent?,Robust.Shared.Prototypes.ComponentRegistry?)"/>
+    EntityUid SpawnInContainerOrDrop(
+        string? protoName,
+        EntityUid containerUid,
+        string containerId,
+        out bool inserted,
+        TransformComponent? xform = null,
+        ContainerManagerComponent? containerComp = null,
+        ComponentRegistry? overrides = null);
+
     /// <summary>
-    /// Attempts to spawn an entity adjacent to some other entity. If the other entity is in a container, this will
-    /// attempt to insert the new entity into the same container.
+    /// Attempts to spawn an entity adjacent to some other target entity. If the target entity is in
+    /// a container, this will attempt to insert the spawned entity into the same container. If the insertion fails,
+    /// the entity is deleted. If the entity is not in a container, this behaves like <see cref="SpawnNextToOrDrop"/>.
     /// </summary>
     bool TrySpawnNextTo(
         string? protoName,

Robust.Shared/GameObjects/IEntityManager.cs

@@ -4,6 +4,7 @@ using System.Diagnostics.CodeAnalysis;
 using JetBrains.Annotations;
 using Prometheus;
 using Robust.Shared.Map;
+using Robust.Shared.Maths;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Timing;
 
@@ -76,10 +77,12 @@ namespace Robust.Shared.GameObjects
 
         EntityUid CreateEntityUninitialized(string? prototypeName, EntityCoordinates coordinates, ComponentRegistry? overrides = null);
 
-        EntityUid CreateEntityUninitialized(string? prototypeName, MapCoordinates coordinates, ComponentRegistry? overrides = null);
+        EntityUid CreateEntityUninitialized(string? prototypeName, MapCoordinates coordinates, ComponentRegistry? overrides = null, Angle rotation = default!);
 
         void InitializeAndStartEntity(EntityUid entity, MapId? mapId = null);
 
+        void InitializeAndStartEntity(Entity<MetaDataComponent?> entity, bool doMapInit);
+
         void InitializeEntity(EntityUid entity, MetaDataComponent? meta = null);
 
         void StartEntity(EntityUid entity);

Robust.Shared/GameObjects/RegisterComponentAttribute.cs

@@ -1,16 +0,0 @@
-using System;
-using JetBrains.Annotations;
-
-namespace Robust.Shared.GameObjects
-{
-    /// <summary>
-    ///     Marks a component as being automatically registered by <see cref="IComponentFactory.DoAutoRegistrations" />
-    /// </summary>
-    [AttributeUsage(AttributeTargets.Class, Inherited = false)]
-    [BaseTypeRequired(typeof(IComponent))]
-    [MeansImplicitUse]
-    public sealed class RegisterComponentAttribute : Attribute
-    {
-
-    }
-}

Robust.Shared/GameObjects/Systems/EntityLookup.Queries.cs

@@ -67,7 +67,7 @@ public sealed partial class EntityLookupSystem
             }
         }
 
-        foreach (var uid in toAdd)
+        foreach (var uid in toAdd.Span)
         {
             intersecting.Add(uid);
         }