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 +54,174 @@ 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

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/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/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.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();
 
@@ -658,11 +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)
                 {
@@ -675,26 +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);
                         }
                     }
 
@@ -703,16 +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.
@@ -721,17 +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)
             {
@@ -743,12 +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}");
     }
 
@@ -896,7 +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);
         }
@@ -964,7 +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;
 
@@ -1098,17 +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.
@@ -1123,7 +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);

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/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/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

@@ -851,7 +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.
@@ -886,6 +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
          */
@@ -1429,7 +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/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/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);
         }

Robust.Shared/GameObjects/Systems/EntityLookupSystem.ComponentQueries.cs

@@ -58,7 +58,7 @@ public sealed partial class EntityLookupSystem
             }
         }
 
-        foreach (var uid in toAdd)
+        foreach (var uid in toAdd.Span)
         {
             intersecting.Add(uid);
         }

Robust.Shared/GameObjects/Systems/SharedAppearanceSystem.cs

@@ -74,6 +74,28 @@ public abstract class SharedAppearanceSystem : EntitySystem
 
         return component.AppearanceData.TryGetValue(key, out value);
     }
+
+    /// <summary>
+    /// Copies appearance data from <c>src</c> to <c>dest</c>.
+    /// If <c>src</c> has no <see cref="AppearanceComponent"/> nothing is done.
+    /// If <c>dest</c> has no <c>AppearanceComponent</c> then it is created.
+    /// </summary>
+    public void CopyData(Entity<AppearanceComponent?> src, Entity<AppearanceComponent?> dest)
+    {
+        if (!Resolve(src, ref src.Comp, false))
+            return;
+
+        dest.Comp ??= EnsureComp<AppearanceComponent>(dest);
+        dest.Comp.AppearanceData.Clear();
+
+        foreach (var (key, value) in src.Comp.AppearanceData)
+        {
+            dest.Comp.AppearanceData[key] = value;
+        }
+
+        Dirty(dest, dest.Comp);
+        QueueUpdate(dest, dest.Comp);
+    }
 }
 
 [Serializable, NetSerializable]

Robust.Shared/GameObjects/Systems/SharedGridFixtureSystem.cs

@@ -180,7 +180,7 @@ namespace Robust.Shared.GameObjects
                 toRemove.Add((oldId, oldFixture));
             }
 
-            foreach (var (id, fixture) in toRemove)
+            foreach (var (id, fixture) in toRemove.Span)
             {
                 // TODO add a DestroyFixture() override that takes in a list.
                 // reduced broadphase lookups
@@ -194,7 +194,7 @@ namespace Robust.Shared.GameObjects
             }
 
             // Anything remaining is a new fixture (or at least, may have not serialized onto the chunk yet).
-            foreach (var (id, fixture) in newFixtures)
+            foreach (var (id, fixture) in newFixtures.Span)
             {
                 var existingFixture = _fixtures.GetFixtureOrNull(uid, id, manager: manager);
                 // Check if it's the same (otherwise remove anyway).

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

@@ -1,68 +1,188 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
 using Robust.Shared.GameStates;
-using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Map.Components;
+using Robust.Shared.Physics.Dynamics;
 using Robust.Shared.Utility;
 
 namespace Robust.Shared.GameObjects;
 
 public abstract partial class SharedMapSystem
 {
+    protected int LastMapId;
+
     private void InitializeMap()
     {
-        SubscribeLocalEvent<MapComponent, ComponentAdd>(OnMapAdd);
-        SubscribeLocalEvent<MapComponent, ComponentInit>(OnMapInit);
+        SubscribeLocalEvent<MapComponent, ComponentAdd>(OnComponentAdd);
+        SubscribeLocalEvent<MapComponent, ComponentInit>(OnCompInit);
+        SubscribeLocalEvent<MapComponent, ComponentStartup>(OnCompStartup);
+        SubscribeLocalEvent<MapComponent, MapInitEvent>(OnMapInit);
         SubscribeLocalEvent<MapComponent, ComponentShutdown>(OnMapRemoved);
         SubscribeLocalEvent<MapComponent, ComponentHandleState>(OnMapHandleState);
         SubscribeLocalEvent<MapComponent, ComponentGetState>(OnMapGetState);
     }
 
+    public bool MapExists([NotNullWhen(true)] MapId? mapId)
+    {
+        return mapId != null && Maps.ContainsKey(mapId.Value);
+    }
+
+    public EntityUid GetMap(MapId mapId)
+    {
+        return Maps[mapId];
+    }
+
+    public bool TryGetMap([NotNullWhen(true)] MapId? mapId, [NotNullWhen(true)] out EntityUid? uid)
+    {
+        if (mapId == null || !Maps.TryGetValue(mapId.Value, out var map))
+        {
+            uid = null;
+            return false;
+        }
+
+        uid = map;
+        return true;
+    }
+
     private void OnMapHandleState(EntityUid uid, MapComponent component, ref ComponentHandleState args)
     {
         if (args.Current is not MapComponentState state)
             return;
 
-        component.MapId = state.MapId;
-
-        if (!MapManager.MapExists(state.MapId))
+        if (component.MapId == MapId.Nullspace)
         {
-            var mapInternal = (IMapManagerInternal)MapManager;
-            mapInternal.CreateMap(state.MapId, uid);
+            if (state.MapId == MapId.Nullspace)
+                throw new Exception($"Received invalid map state? {ToPrettyString(uid)}");
+
+            component.MapId = state.MapId;
+            Maps.Add(component.MapId, uid);
+            RecursiveMapIdUpdate(uid, uid, component.MapId);
         }
 
+        DebugTools.AssertEqual(component.MapId, state.MapId);
         component.LightingEnabled = state.LightingEnabled;
-        var xformQuery = GetEntityQuery<TransformComponent>();
+        component.MapInitialized = state.Initialized;
 
-        xformQuery.GetComponent(uid).ChangeMapId(state.MapId, xformQuery);
+        if (LifeStage(uid) >= EntityLifeStage.Initialized)
+            SetPaused(uid, state.MapPaused);
+        else
+            component.MapPaused = state.MapPaused;
+    }
 
-        MapManager.SetMapPaused(state.MapId, state.MapPaused);
+    private void RecursiveMapIdUpdate(EntityUid uid, EntityUid mapUid, MapId mapId)
+    {
+        // This is required only in the event where an entity becomes a map AFTER children have already been attached to it.
+        // AFAIK, this currently only happens when the client applies entity states out of order (i.e., ignoring transform hierarchy),
+        // which itself only happens if PVS is disabled.
+        // TODO MAPS remove this
+
+        var xform = Transform(uid);
+        xform.MapUid = mapUid;
+        xform.MapID = mapId;
+        xform._mapIdInitialized = true;
+        foreach (var child in xform._children)
+        {
+            RecursiveMapIdUpdate(child, mapUid, mapId);
+        }
     }
 
     private void OnMapGetState(EntityUid uid, MapComponent component, ref ComponentGetState args)
     {
-        args.State = new MapComponentState(component.MapId, component.LightingEnabled, component.MapPaused);
+        args.State = new MapComponentState(component.MapId, component.LightingEnabled, component.MapPaused, component.MapInitialized);
     }
 
-    protected abstract void OnMapAdd(EntityUid uid, MapComponent component, ComponentAdd args);
+    protected abstract MapId GetNextMapId();
 
-    private void OnMapInit(EntityUid uid, MapComponent component, ComponentInit args)
+    private void OnComponentAdd(EntityUid uid, MapComponent component, ComponentAdd args)
     {
+        // ordered startups when
+        EnsureComp<PhysicsMapComponent>(uid);
         EnsureComp<GridTreeComponent>(uid);
         EnsureComp<MovedGridsComponent>(uid);
+    }
+
+    private void OnCompInit(EntityUid uid, MapComponent component, ComponentInit args)
+    {
+        if (component.MapId == MapId.Nullspace)
+            component.MapId = GetNextMapId();
+
+        DebugTools.AssertEqual(component.MapId.IsClientSide, IsClientSide(uid));
+        if (!Maps.TryAdd(component.MapId, uid))
+        {
+            if (Maps[component.MapId] != uid)
+                throw new Exception($"Attempted to initialize a map {ToPrettyString(uid)} with a duplicate map id {component.MapId}");
+        }
 
         var msg = new MapChangedEvent(uid, component.MapId, true);
         RaiseLocalEvent(uid, msg, true);
     }
 
+    private void OnCompStartup(EntityUid uid, MapComponent component, ComponentStartup args)
+    {
+        if (component.MapPaused)
+            RecursiveSetPaused(uid, true);
+    }
+
     private void OnMapRemoved(EntityUid uid, MapComponent component, ComponentShutdown args)
     {
         DebugTools.Assert(component.MapId != MapId.Nullspace);
-        Log.Info($"Deleting map {component.MapId}");
-
-        var iMap = (IMapManagerInternal)MapManager;
-        iMap.RemoveMapId(component.MapId);
+        Maps.Remove(component.MapId);
 
         var msg = new MapChangedEvent(uid, component.MapId, false);
         RaiseLocalEvent(uid, msg, true);
     }
+
+    /// <summary>
+    ///     Creates a new map, automatically assigning a map id.
+    /// </summary>
+    public EntityUid CreateMap(out MapId mapId, bool runMapInit = true)
+    {
+        mapId = GetNextMapId();
+        var uid = CreateMap(mapId, runMapInit);
+        return uid;
+    }
+
+    /// <inheritdoc cref="CreateMap(out Robust.Shared.Map.MapId,bool)"/>
+    public EntityUid CreateMap(bool runMapInit = true) => CreateMap(out _, runMapInit);
+
+    /// <summary>
+    ///     Creates a new map with the specified map id.
+    /// </summary>
+    /// <exception cref="ArgumentException">Throws if an invalid or already existing map id is provided.</exception>
+    public EntityUid CreateMap(MapId mapId, bool runMapInit = true)
+    {
+        if (Maps.ContainsKey(mapId))
+            throw new ArgumentException($"Map with id {mapId} already exists");
+
+        if (mapId == MapId.Nullspace)
+            throw new ArgumentException($"Cannot create a null-space map");
+
+        if (_netManager.IsServer && mapId.IsClientSide)
+            throw new ArgumentException($"Attempted to create a client-side map on the server?");
+
+        if (_netManager.IsClient && _netManager.IsConnected && !mapId.IsClientSide)
+            throw new ArgumentException($"Attempted to create a client-side map entity with a non client-side map ID?");
+
+        var uid = EntityManager.CreateEntityUninitialized(null);
+        var map = _factory.GetComponent<MapComponent>();
+        map.MapId = mapId;
+        AddComp(uid, map);
+
+        // Give the entity a name, mainly for debugging. Content can always override this with a localized name.
+        var meta = MetaData(uid);
+        _meta.SetEntityName(uid, $"Map Entity", meta);
+
+        // Initialize components. this should add the map id to the collections.
+        EntityManager.InitializeComponents(uid, meta);
+        EntityManager.StartComponents(uid);
+        DebugTools.Assert(Maps[mapId] == uid);
+
+        if (runMapInit)
+            InitializeMap((uid, map));
+        else
+            SetPaused((uid, map), true);
+
+        return uid;
+    }
 }

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

@@ -0,0 +1,83 @@
+using System;
+using System.Collections.Generic;
+using Robust.Shared.Map;
+using Robust.Shared.Map.Components;
+using Robust.Shared.Utility;
+
+namespace Robust.Shared.GameObjects;
+
+public abstract partial class SharedMapSystem
+{
+    public bool IsInitialized(MapId mapId)
+    {
+        if (mapId == MapId.Nullspace)
+            return true; // Nullspace is always initialized
+
+        if(!Maps.TryGetValue(mapId, out var uid))
+            throw new ArgumentException($"Map {mapId} does not exist.");
+
+        return IsInitialized(uid);
+    }
+    public bool IsInitialized(EntityUid? map)
+    {
+        if (map == null)
+            return true; // Nullspace is always initialized
+
+        return IsInitialized(map.Value);
+    }
+
+    public bool IsInitialized(Entity<MapComponent?> map)
+    {
+        if (!_mapQuery.Resolve(map, ref map.Comp))
+            return false;
+
+        return map.Comp.MapInitialized;
+    }
+
+    private void OnMapInit(EntityUid uid, MapComponent component, MapInitEvent args)
+    {
+        DebugTools.Assert(!component.MapInitialized);
+        component.MapInitialized = true;
+        EntityManager.Dirty(uid, component);
+    }
+
+    public void InitializeMap(MapId mapId, bool unpause = true)
+    {
+        if(!Maps.TryGetValue(mapId, out var uid))
+            throw new ArgumentException($"Map {mapId} does not exist.");
+
+        InitializeMap(uid, unpause);
+    }
+
+    public void InitializeMap(Entity<MapComponent?> map, bool unpause = true)
+    {
+        if (!_mapQuery.Resolve(map, ref map.Comp))
+            return;
+
+        if (map.Comp.MapInitialized)
+            throw new ArgumentException($"Map {ToPrettyString(map)} is already initialized.");
+
+        RecursiveMapInit(map.Owner);
+
+        if (unpause)
+            SetPaused(map, false);
+    }
+
+    private void RecursiveMapInit(EntityUid entity)
+    {
+        var toInitialize = new List<EntityUid> {entity};
+        for (var i = 0; i < toInitialize.Count; i++)
+        {
+            var uid = toInitialize[i];
+            // toInitialize might contain deleted entities.
+            if(!_metaQuery.TryComp(uid, out var meta))
+                continue;
+
+            if (meta.EntityLifeStage == EntityLifeStage.MapInitialized)
+                continue;
+
+            toInitialize.AddRange(Transform(uid)._children);
+            EntityManager.RunMapInit(uid, meta);
+        }
+    }
+}

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

@@ -0,0 +1,60 @@
+using System;
+using Robust.Shared.Map;
+using Robust.Shared.Map.Components;
+
+namespace Robust.Shared.GameObjects;
+
+public abstract partial class SharedMapSystem
+{
+    public bool IsPaused(MapId mapId)
+    {
+        if (mapId == MapId.Nullspace)
+            return false;
+
+        if(!Maps.TryGetValue(mapId, out var uid))
+            throw new ArgumentException($"Map {mapId} does not exist.");
+
+        return IsPaused(uid);
+    }
+
+    public bool IsPaused(Entity<MapComponent?> map)
+    {
+        if (!_mapQuery.Resolve(map, ref map.Comp))
+            return false;
+
+        return map.Comp.MapPaused;
+    }
+
+    public void SetPaused(MapId mapId, bool paused)
+    {
+        if(!Maps.TryGetValue(mapId, out var uid))
+            throw new ArgumentException($"Map {mapId} does not exist.");
+
+        SetPaused(uid, paused);
+    }
+
+    public void SetPaused(Entity<MapComponent?> map, bool paused)
+    {
+        if (!_mapQuery.Resolve(map, ref map.Comp))
+            return;
+
+        if (map.Comp.MapPaused == paused)
+            return;
+
+        map.Comp.MapPaused = paused;
+        if (map.Comp.LifeStage < ComponentLifeStage.Initializing)
+            return;
+
+        Dirty(map);
+        RecursiveSetPaused(map, paused);
+    }
+
+    private void RecursiveSetPaused(EntityUid entity, bool paused)
+    {
+        _meta.SetEntityPaused(entity, paused);
+        foreach (var child in Transform(entity)._children)
+        {
+            RecursiveSetPaused(child, paused);
+        }
+    }
+}

Robust.Shared/GameObjects/Systems/SharedMapSystem.cs

@@ -20,17 +20,23 @@ namespace Robust.Shared.GameObjects
         [Dependency] private readonly FixtureSystem _fixtures = default!;
         [Dependency] private readonly SharedPhysicsSystem _physics = default!;
         [Dependency] private readonly SharedTransformSystem _transform = default!;
+        [Dependency] private readonly IComponentFactory _factory = default!;
+        [Dependency] private readonly MetaDataSystem _meta = default!;
 
         private EntityQuery<MapComponent> _mapQuery;
         private EntityQuery<MapGridComponent> _gridQuery;
+        private EntityQuery<MetaDataComponent> _metaQuery;
         private EntityQuery<TransformComponent> _xformQuery;
 
+        internal Dictionary<MapId, EntityUid> Maps { get; } = new();
+
         public override void Initialize()
         {
             base.Initialize();
 
             _mapQuery = GetEntityQuery<MapComponent>();
             _gridQuery = GetEntityQuery<MapGridComponent>();
+            _metaQuery = GetEntityQuery<MetaDataComponent>();
             _xformQuery = GetEntityQuery<TransformComponent>();
 
             InitializeMap();

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

@@ -199,47 +199,34 @@ public abstract partial class SharedTransformSystem
 
     #region Component Lifetime
 
+    private (EntityUid?, MapId) InitializeMapUid(EntityUid uid, TransformComponent xform)
+    {
+        if (xform._mapIdInitialized)
+            return (xform.MapUid, xform.MapID);
+
+        if (xform.ParentUid.IsValid())
+        {
+            (xform.MapUid, xform.MapID) = InitializeMapUid(xform.ParentUid, Transform(xform.ParentUid));
+        }
+        else if (_mapQuery.TryComp(uid, out var mapComp))
+        {
+            DebugTools.AssertNotEqual(mapComp.MapId, MapId.Nullspace);
+            xform.MapUid = uid;
+            xform.MapID = mapComp.MapId;
+        }
+        else
+        {
+            xform.MapUid = null;
+            xform.MapID = MapId.Nullspace;
+        }
+
+        xform._mapIdInitialized = true;
+        return (xform.MapUid, xform.MapID);
+    }
+
     private void OnCompInit(EntityUid uid, TransformComponent component, ComponentInit args)
     {
-        // Children MAY be initialized here before their parents are.
-        // We do this whole dance to handle this recursively,
-        // setting _mapIdInitialized along the way to avoid going to the MapComponent every iteration.
-        static MapId FindMapIdAndSet(EntityUid uid, TransformComponent xform, IEntityManager entMan, EntityQuery<TransformComponent> xformQuery, IMapManager mapManager)
-        {
-            if (xform._mapIdInitialized)
-                return xform.MapID;
-
-            MapId value;
-
-            if (xform.ParentUid.IsValid())
-            {
-                value = FindMapIdAndSet(xform.ParentUid, xformQuery.GetComponent(xform.ParentUid), entMan, xformQuery, mapManager);
-            }
-            else
-            {
-                // second level node, terminates recursion up the branch of the tree
-                if (entMan.TryGetComponent(uid, out MapComponent? mapComp))
-                {
-                    value = mapComp.MapId;
-                }
-                else
-                {
-                    // We allow entities to be spawned directly into null-space.
-                    value = MapId.Nullspace;
-                }
-            }
-
-            xform.MapUid = value == MapId.Nullspace ? null : mapManager.GetMapEntityId(value);
-            xform.MapID = value;
-            xform._mapIdInitialized = true;
-            return value;
-        }
-
-        if (!component._mapIdInitialized)
-        {
-            FindMapIdAndSet(uid, component, EntityManager, XformQuery, _mapManager);
-            component._mapIdInitialized = true;
-        }
+        InitializeMapUid(uid, component);
 
         // Has to be done if _parent is set from ExposeData.
         if (component.ParentUid.IsValid())
@@ -522,6 +509,8 @@ public abstract partial class SharedTransformSystem
                     throw new InvalidOperationException($"Attempted to re-parent to a terminating object. Entity: {ToPrettyString(uid)}, new parent: {ToPrettyString(value.EntityId)}");
                 }
 
+                InitializeMapUid(value.EntityId, newParent);
+
                 // Check for recursive/circular transform hierarchies.
                 if (xform.MapUid == newParent.MapUid)
                 {
@@ -881,6 +870,28 @@ public abstract partial class SharedTransformSystem
         return GetMapCoordinates(entity.Comp);
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public void SetMapCoordinates(EntityUid entity, MapCoordinates coordinates)
+    {
+        var xform = XformQuery.GetComponent(entity);
+        SetMapCoordinates((entity, xform), coordinates);
+    }
+
+    public void SetMapCoordinates(Entity<TransformComponent> entity, MapCoordinates coordinates)
+    {
+        var mapUid = _map.GetMap(coordinates.MapId);
+        if (!_gridQuery.HasComponent(entity) &&
+            _mapManager.TryFindGridAt(mapUid, coordinates.Position, out var targetGrid, out _))
+        {
+            var invWorldMatrix = GetInvWorldMatrix(targetGrid);
+            SetCoordinates(entity, new EntityCoordinates(targetGrid, invWorldMatrix.Transform(coordinates.Position)));
+        }
+        else
+        {
+            SetCoordinates(entity, new EntityCoordinates(mapUid, coordinates.Position));
+        }
+    }
+
     [Pure]
     public (Vector2 WorldPosition, Angle WorldRotation) GetWorldPositionRotation(EntityUid uid)
     {
@@ -993,7 +1004,7 @@ public abstract partial class SharedTransformSystem
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public void SetWorldPosition(Entity<TransformComponent> entity, Vector2 worldPos)
     {
-        SetWorldPositionRotation(entity.Owner, worldPos, entity.Comp.LocalRotation, entity.Comp);
+        SetWorldPositionRotationInternal(entity.Owner, worldPos, null, entity.Comp);
     }
 
     #endregion
@@ -1079,10 +1090,17 @@ public abstract partial class SharedTransformSystem
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public void SetWorldPositionRotation(EntityUid uid, Vector2 worldPos, Angle worldRot, TransformComponent? component = null)
+    {
+        SetWorldPositionRotationInternal(uid, worldPos, worldRot, component);
+    }
+
+    private void SetWorldPositionRotationInternal(EntityUid uid, Vector2 worldPos, Angle? worldRot = null, TransformComponent? component = null)
     {
         if (!XformQuery.Resolve(uid, ref component))
             return;
 
+        // If no worldRot supplied then default the new rotation to 0.
+
         if (!component._parent.IsValid() || component.MapUid == null)
         {
             DebugTools.Assert("Parent is invalid while attempting to set WorldPosition - did you try to move root node?");
@@ -1453,8 +1471,7 @@ public abstract partial class SharedTransformSystem
         while (targetXform.ParentUid.IsValid())
         {
             if (_container.IsEntityInContainer(targetUid)
-                && _container.TryGetContainingContainer(targetXform.ParentUid, targetUid, out var container,
-                    skipExistCheck: true)
+                && _container.TryGetContainingContainer(targetXform.ParentUid, targetUid, out var container)
                 && _container.Insert((entity, xform, null, null), container))
             {
                 return;

Robust.Shared/GameObjects/Systems/SharedTransformSystem.cs

@@ -26,6 +26,7 @@ namespace Robust.Shared.GameObjects
         [Dependency] private readonly INetManager _netMan = default!;
         [Dependency] private readonly SharedContainerSystem _container = default!;
 
+        private EntityQuery<MapComponent> _mapQuery;
         private EntityQuery<MapGridComponent> _gridQuery;
         private EntityQuery<MetaDataComponent> _metaQuery;
         protected EntityQuery<TransformComponent> XformQuery;
@@ -50,6 +51,7 @@ namespace Robust.Shared.GameObjects
 
             UpdatesOutsidePrediction = true;
 
+            _mapQuery = GetEntityQuery<MapComponent>();
             _gridQuery = GetEntityQuery<MapGridComponent>();
             _metaQuery = GetEntityQuery<MetaDataComponent>();
             XformQuery = GetEntityQuery<TransformComponent>();

Robust.Shared/Map/Components/MapComponent.cs

@@ -12,35 +12,29 @@ namespace Robust.Shared.Map.Components
     public sealed partial class MapComponent : Component
     {
         [ViewVariables(VVAccess.ReadWrite)]
-        [DataField("lightingEnabled")]
+        [DataField]
         public bool LightingEnabled { get; set; } = true;
 
         [ViewVariables(VVAccess.ReadOnly)]
         public MapId MapId { get; internal set; } = MapId.Nullspace;
 
-        [ViewVariables(VVAccess.ReadOnly)]
-        public bool MapPaused { get; set; } = false;
+        [DataField, Access(typeof(SharedMapSystem), typeof(MapManager))]
+        public bool MapPaused;
 
-        //TODO replace MapPreInit with the map's entity life stage
-        [ViewVariables(VVAccess.ReadOnly)]
-        public bool MapPreInit { get; set; } = false;
+        [DataField, Access(typeof(SharedMapSystem), typeof(MapManager))]
+        public bool MapInitialized;
     }
 
     /// <summary>
     ///     Serialized state of a <see cref="MapGridComponentState"/>.
     /// </summary>
     [Serializable, NetSerializable]
-    public sealed class MapComponentState : ComponentState
+    public sealed class MapComponentState(MapId mapId, bool lightingEnabled, bool paused, bool init)
+        : ComponentState
     {
-        public MapId MapId;
-        public bool LightingEnabled;
-        public bool MapPaused;
-
-        public MapComponentState(MapId mapId, bool lightingEnabled, bool paused)
-        {
-            MapId = mapId;
-            LightingEnabled = lightingEnabled;
-            MapPaused = paused;
-        }
+        public MapId MapId = mapId;
+        public bool LightingEnabled = lightingEnabled;
+        public bool MapPaused = paused;
+        public bool Initialized = init;
     }
 }

Robust.Shared/Map/IMapManager.cs

@@ -23,9 +23,6 @@ namespace Robust.Shared.Map
         public const bool Approximate = false;
         public const bool IncludeMap = true;
 
-        [Obsolete("Use EntityQuery<MapGridComponent>")]
-        IEnumerable<MapGridComponent> GetAllGrids();
-
         /// <summary>
         ///     Should the OnTileChanged event be suppressed? This is useful for initially loading the map
         ///     so that you don't spam an event for each of the million station tiles.
@@ -42,16 +39,7 @@ namespace Robust.Shared.Map
 
         void Restart();
 
-        /// <summary>
-        ///     Creates a new map.
-        /// </summary>
-        /// <param name="mapId">
-        ///     If provided, the new map will use this ID. If not provided, a new ID will be selected automatically.
-        /// </param>
-        /// <returns>The new map.</returns>
-        /// <exception cref="InvalidOperationException">
-        ///     Throw if an explicit ID for the map or default grid is passed and a map or grid with the specified ID already exists, respectively.
-        /// </exception>
+        [Obsolete("Use MapSystem")]
         MapId CreateMap(MapId? mapId = null);
 
         /// <summary>
@@ -59,24 +47,12 @@ namespace Robust.Shared.Map
         /// </summary>
         /// <param name="mapId">The map ID to check existence of.</param>
         /// <returns>True if the map exists, false otherwise.</returns>
-        bool MapExists(MapId mapId);
+        bool MapExists([NotNullWhen(true)] MapId? mapId);
 
         /// <summary>
-        /// Creates a new entity, then sets it as the map entity.
-        /// </summary>
-        /// <returns>Newly created entity.</returns>
-        EntityUid CreateNewMapEntity(MapId mapId);
-
-        /// <summary>
-        /// Sets the MapEntity(root node) for a given map. If an entity is already set, it will be deleted
-        /// before the new one is set.
-        /// </summary>
-        /// <param name="updateChildren">Should we re-parent children from the old map to the new one, or delete them.</param>
-        void SetMapEntity(MapId mapId, EntityUid newMapEntityId, bool updateChildren = true);
-
-        /// <summary>
-        /// Returns the map entity ID for a given map.
+        /// Returns the map entity ID for a given map, or an invalid entity Id if the map does not exist.
         /// </summary>
+        [Obsolete("Use TryGetMap")]
         EntityUid GetMapEntityId(MapId mapId);
 
         /// <summary>
@@ -93,6 +69,7 @@ namespace Robust.Shared.Map
         MapGridComponent CreateGrid(MapId currentMapId, in GridCreateOptions options);
         MapGridComponent CreateGrid(MapId currentMapId);
         Entity<MapGridComponent> CreateGridEntity(MapId currentMapId, GridCreateOptions? options = null);
+        Entity<MapGridComponent> CreateGridEntity(EntityUid map, GridCreateOptions? options = null);
 
         [Obsolete("Use GetComponent<MapGridComponent>(uid)")]
         MapGridComponent GetGrid(EntityUid gridId);
@@ -233,17 +210,13 @@ namespace Robust.Shared.Map
 
         #endregion
 
-        void DeleteGrid(EntityUid euid);
 
-        bool HasMapEntity(MapId mapId);
+        [Obsolete("Just delete the grid entity")]
+        void DeleteGrid(EntityUid euid);
 
         bool IsGrid(EntityUid uid);
         bool IsMap(EntityUid uid);
 
-        [Obsolete("Whatever this is used for, it is a terrible idea. Create a new map and get it's MapId.")]
-        MapId NextMapId();
-        MapGridComponent GetGridComp(EntityUid euid);
-
         //
         // Pausing functions
         //
@@ -252,14 +225,15 @@ namespace Robust.Shared.Map
 
         void DoMapInitialize(MapId mapId);
 
-        // TODO rename this to actually be descriptive or just remove it.
+        [Obsolete("Use CreateMap's runMapInit argument")]
         void AddUninitializedMap(MapId mapId);
 
-        [Pure]
+        [Obsolete("Use MapSystem")]
         bool IsMapPaused(MapId mapId);
 
-        [Pure]
+        [Obsolete("Use MapSystem")]
         bool IsMapInitialized(MapId mapId);
+
     }
 
     public struct GridCreateOptions

Robust.Shared/Map/IMapManagerInternal.cs

@@ -1,23 +1,15 @@
-using Robust.Shared.GameObjects;
 using Robust.Shared.Maths;
-using Robust.Shared.Timing;
 
 namespace Robust.Shared.Map
 {
     /// <inheritdoc />
     internal interface IMapManagerInternal : IMapManager
     {
-        IGameTiming GameTiming { get; }
-
         /// <summary>
         ///     Raises the OnTileChanged event.
         /// </summary>
         /// <param name="tileRef">A reference to the new tile.</param>
         /// <param name="oldTile">The old tile that got replaced.</param>
         void RaiseOnTileChanged(TileRef tileRef, Tile oldTile, Vector2i chunk);
-
-        MapId CreateMap(MapId? mapId, EntityUid euid);
-
-        void RemoveMapId(MapId mapId);
     }
 }

Robust.Shared/Map/MapId.cs

@@ -53,5 +53,7 @@ namespace Robust.Shared.Map
         {
             return Value.ToString();
         }
+
+        public bool IsClientSide => Value < 0;
     }
 }

Robust.Shared/Map/MapManager.GridCollection.cs

@@ -12,32 +12,15 @@ using Robust.Shared.Utility;
 namespace Robust.Shared.Map;
 internal partial class MapManager
 {
-    [Obsolete("Use GetComponent<MapGridComponent>(uid)")]
-    public MapGridComponent GetGridComp(EntityUid euid)
-    {
-        return EntityManager.GetComponent<MapGridComponent>(euid);
-    }
-
-    [Obsolete("Use EntityQuery instead.")]
-    public IEnumerable<MapGridComponent> GetAllGrids()
-    {
-        var compQuery = EntityManager.AllEntityQueryEnumerator<MapGridComponent>();
-
-        while (compQuery.MoveNext(out var comp))
-        {
-            yield return comp;
-        }
-    }
-
     // ReSharper disable once MethodOverloadWithOptionalParameter
     public MapGridComponent CreateGrid(MapId currentMapId, ushort chunkSize = 16)
     {
-        return CreateGrid(currentMapId, chunkSize, default);
+        return CreateGrid(GetMapEntityIdOrThrow(currentMapId), chunkSize, default);
     }
 
     public MapGridComponent CreateGrid(MapId currentMapId, in GridCreateOptions options)
     {
-        return CreateGrid(currentMapId, options.ChunkSize, default);
+        return CreateGrid(GetMapEntityIdOrThrow(currentMapId), options.ChunkSize, default);
     }
 
     public MapGridComponent CreateGrid(MapId currentMapId)
@@ -46,18 +29,19 @@ internal partial class MapManager
     }
 
     public Entity<MapGridComponent> CreateGridEntity(MapId currentMapId, GridCreateOptions? options = null)
+    {
+        return CreateGridEntity(GetMapEntityIdOrThrow(currentMapId), options);
+    }
+
+    public Entity<MapGridComponent> CreateGridEntity(EntityUid map, GridCreateOptions? options = null)
     {
         options ??= GridCreateOptions.Default;
-        return CreateGrid(currentMapId, options.Value.ChunkSize, default);
+        return CreateGrid(map, options.Value.ChunkSize, default);
     }
 
     [Obsolete("Use GetComponent<MapGridComponent>(uid)")]
     public MapGridComponent GetGrid(EntityUid gridId)
-    {
-        DebugTools.Assert(gridId.IsValid());
-
-        return GetGridComp(gridId);
-    }
+        => EntityManager.GetComponent<MapGridComponent>(gridId);
 
     [Obsolete("Use HasComponent<MapGridComponent>(uid)")]
     public bool IsGrid(EntityUid uid)
@@ -108,10 +92,6 @@ internal partial class MapManager
 
     public virtual void DeleteGrid(EntityUid euid)
     {
-#if DEBUG
-        DebugTools.Assert(_dbgGuardRunning);
-#endif
-
         // Possible the grid was already deleted / is invalid
         if (!EntityManager.TryGetComponent<MapGridComponent>(euid, out var iGrid))
         {
@@ -141,10 +121,6 @@ internal partial class MapManager
     /// <param name="oldTile">The old tile that got replaced.</param>
     public void RaiseOnTileChanged(TileRef tileRef, Tile oldTile, Vector2i chunk)
     {
-#if DEBUG
-        DebugTools.Assert(_dbgGuardRunning);
-#endif
-
         if (SuppressOnTileChanged)
             return;
 
@@ -153,7 +129,7 @@ internal partial class MapManager
         EntityManager.EventBus.RaiseLocalEvent(euid, ref ev, true);
     }
 
-    protected Entity<MapGridComponent> CreateGrid(MapId currentMapId, ushort chunkSize, EntityUid forcedGridEuid)
+    protected Entity<MapGridComponent> CreateGrid(EntityUid map, ushort chunkSize, EntityUid forcedGridEuid)
     {
         var gridEnt = EntityManager.CreateEntityUninitialized(null, forcedGridEuid);
 
@@ -166,8 +142,7 @@ internal partial class MapManager
         //are applied. After they are applied the parent may be different, but the MapId will
         //be the same. This causes TransformComponent.ParentUid of a grid to be unsafe to
         //use in transform states anytime before the state parent is properly set.
-        var fallbackParentEuid = GetMapEntityIdOrThrow(currentMapId);
-        EntityManager.GetComponent<TransformComponent>(gridEnt).AttachParent(fallbackParentEuid);
+        EntityManager.GetComponent<TransformComponent>(gridEnt).AttachParent(map);
 
         var meta = EntityManager.GetComponent<MetaDataComponent>(gridEnt);
         EntityManager.System<MetaDataSystem>().SetEntityName(gridEnt, $"grid", meta);

Robust.Shared/Map/MapManager.GridTrees.cs

@@ -1,12 +0,0 @@
-namespace Robust.Shared.Map;
-
-internal partial class MapManager
-{
-    public void RemoveMapId(MapId mapId)
-    {
-        if (mapId == MapId.Nullspace)
-            return;
-
-        _mapEntities.Remove(mapId);
-    }
-}

Robust.Shared/Map/MapManager.MapCollection.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Map.Components;
 using Robust.Shared.Utility;
@@ -27,131 +28,42 @@ public sealed class MapEventArgs : EventArgs
 
 internal partial class MapManager
 {
-    private readonly Dictionary<MapId, EntityUid> _mapEntities = new();
-    private MapId _highestMapId = MapId.Nullspace;
+    private Dictionary<MapId, EntityUid> _mapEntities => _mapSystem.Maps;
 
     /// <inheritdoc />
     public virtual void DeleteMap(MapId mapId)
     {
-#if DEBUG
-        DebugTools.Assert(_dbgGuardRunning);
-#endif
-
         if (!_mapEntities.TryGetValue(mapId, out var ent) || !ent.IsValid())
             throw new InvalidOperationException($"Attempted to delete nonexistent map '{mapId}'");
 
         EntityManager.DeleteEntity(ent);
+        DebugTools.Assert(!_mapEntities.ContainsKey(mapId));
     }
 
     /// <inheritdoc />
     public MapId CreateMap(MapId? mapId = null)
     {
-        return ((IMapManagerInternal) this).CreateMap(mapId, default);
+        if (mapId != null)
+        {
+            _mapSystem.CreateMap(mapId.Value);
+            return mapId.Value;
+        }
+
+        _mapSystem.CreateMap(out var map);
+        return map;
     }
 
     /// <inheritdoc />
-    public bool MapExists(MapId mapId)
+    public bool MapExists([NotNullWhen(true)] MapId? mapId)
     {
-        return _mapEntities.ContainsKey(mapId);
-    }
-
-    /// <inheritdoc />
-    public EntityUid CreateNewMapEntity(MapId mapId)
-    {
-        DebugTools.Assert(mapId != MapId.Nullspace);
-#if DEBUG
-        DebugTools.Assert(_dbgGuardRunning);
-#endif
-
-        var newEntity = EntityManager.CreateEntityUninitialized(null);
-        SetMapEntity(mapId, newEntity);
-
-        EntityManager.InitializeComponents(newEntity);
-        EntityManager.StartComponents(newEntity);
-
-        return newEntity;
-    }
-
-    /// <inheritdoc />
-    public void SetMapEntity(MapId mapId, EntityUid newMapEntity, bool updateChildren = true)
-    {
-#if DEBUG
-        DebugTools.Assert(_dbgGuardRunning);
-#endif
-
-        if (!_mapEntities.ContainsKey(mapId))
-            throw new InvalidOperationException($"Map {mapId} does not exist.");
-
-        foreach (var kvEntity in _mapEntities)
-        {
-            if (kvEntity.Value == newMapEntity)
-            {
-                if (mapId == kvEntity.Key)
-                    return;
-
-                throw new InvalidOperationException(
-                    $"Entity {newMapEntity} is already the root node of another map {kvEntity.Key}.");
-            }
-        }
-
-        MapComponent? mapComp;
-        // If this is being done as part of maploader then we want to copy the preinit state across mainly.
-        bool preInit = false;
-        bool paused = false;
-
-        // remove existing graph
-        if (_mapEntities.TryGetValue(mapId, out var oldEntId))
-        {
-            if (EntityManager.TryGetComponent(oldEntId, out mapComp))
-            {
-                preInit = mapComp.MapPreInit;
-                paused = mapComp.MapPaused;
-            }
-
-            EntityManager.System<SharedTransformSystem>().ReparentChildren(oldEntId, newMapEntity);
-
-            //Note: EntityUid.Invalid gets passed in here
-            //Note: This prevents setting a subgraph as the root, since the subgraph will be deleted
-            EntityManager.DeleteEntity(oldEntId);
-        }
-
-        var raiseEvent = false;
-
-        // re-use or add map component
-        if (!EntityManager.TryGetComponent(newMapEntity, out mapComp))
-            mapComp = EntityManager.AddComponent<MapComponent>(newMapEntity);
-        else
-        {
-            raiseEvent = true;
-
-            if (mapComp.MapId != mapId)
-            {
-                _sawmill.Warning($"Setting map {mapId} root to entity {newMapEntity}, but entity thinks it is root node of map {mapComp.MapId}.");
-            }
-        }
-
-        _sawmill.Debug($"Setting map {mapId} entity to {newMapEntity}");
-
-        // set as new map entity
-        mapComp.MapPreInit = preInit;
-        mapComp.MapPaused = paused;
-
-        mapComp.MapId = mapId;
-        _mapEntities[mapId] = newMapEntity;
-
-        // Yeah this sucks but I just want to save maps for now, deal.
-        if (raiseEvent)
-        {
-            var ev = new MapChangedEvent(newMapEntity, mapId, true);
-            EntityManager.EventBus.RaiseLocalEvent(newMapEntity, ev, true);
-        }
+        return _mapSystem.MapExists(mapId);
     }
 
     /// <inheritdoc />
     public EntityUid GetMapEntityId(MapId mapId)
     {
-        if (_mapEntities.TryGetValue(mapId, out var entId))
-            return entId;
+        if (_mapSystem.TryGetMap(mapId, out var entId))
+            return entId.Value;
 
         return EntityUid.Invalid;
     }
@@ -161,13 +73,12 @@ internal partial class MapManager
     /// </summary>
     public EntityUid GetMapEntityIdOrThrow(MapId mapId)
     {
-        return _mapEntities[mapId];
+        return _mapSystem.GetMap(mapId);
     }
 
-    /// <inheritdoc />
-    public bool HasMapEntity(MapId mapId)
+    public bool TryGetMap([NotNullWhen(true)] MapId? mapId, [NotNullWhen(true)] out EntityUid? uid)
     {
-        return _mapEntities.ContainsKey(mapId);
+        return _mapSystem.TryGetMap(mapId, out uid);
     }
 
     /// <inheritdoc />
@@ -181,67 +92,4 @@ internal partial class MapManager
     {
         return EntityManager.HasComponent<MapComponent>(uid);
     }
-
-    /// <inheritdoc />
-    public MapId NextMapId()
-    {
-        return _highestMapId = new MapId(_highestMapId.Value + 1);
-    }
-
-    MapId IMapManagerInternal.CreateMap(MapId? mapId, EntityUid entityUid)
-    {
-        if (mapId == MapId.Nullspace)
-            throw new InvalidOperationException("Attempted to create a null-space map.");
-
-#if DEBUG
-        DebugTools.Assert(_dbgGuardRunning);
-#endif
-
-        var actualId = mapId ?? new MapId(_highestMapId.Value + 1);
-
-        if (MapExists(actualId))
-            throw new InvalidOperationException($"A map with ID {actualId} already exists");
-
-        if (_highestMapId.Value < actualId.Value)
-            _highestMapId = actualId;
-
-        _sawmill.Info($"Creating new map {actualId}");
-
-        if (actualId != MapId.Nullspace) // nullspace isn't bound to an entity
-        {
-            Entity<MapComponent> result = default;
-            var query = EntityManager.AllEntityQueryEnumerator<MapComponent>();
-            while (query.MoveNext(out var uid, out var map))
-            {
-                if (map.MapId != actualId)
-                    continue;
-
-                result = (uid, map);
-                break;
-            }
-
-            if (result != default)
-            {
-                DebugTools.Assert(mapId != null);
-                _mapEntities.Add(actualId, result);
-                _sawmill.Debug($"Rebinding map {actualId} to entity {result.Owner}");
-            }
-            else
-            {
-                var newEnt = EntityManager.CreateEntityUninitialized(null, entityUid);
-                _mapEntities.Add(actualId, newEnt);
-
-                var mapComp = EntityManager.AddComponent<MapComponent>(newEnt);
-                mapComp.MapId = actualId;
-                var meta = EntityManager.GetComponent<MetaDataComponent>(newEnt);
-                EntityManager.System<MetaDataSystem>().SetEntityName(newEnt, $"map {actualId}", meta);
-                EntityManager.Dirty(newEnt, mapComp, meta);
-                EntityManager.InitializeComponents(newEnt, meta);
-                EntityManager.StartComponents(newEnt);
-                _sawmill.Debug($"Binding map {actualId} to entity {newEnt}");
-            }
-        }
-
-        return actualId;
-    }
 }