Add some missing Dispose calls, fix some Dispose implementations.

OpenRA.Game/FileSystem/InstallShieldCABExtractor.cs

@@ -17,7 +17,7 @@ using ICSharpCode.SharpZipLib.Zip.Compression;
 
 namespace OpenRA.FileSystem
 {
-	public class InstallShieldCABExtractor : IFolder
+	public sealed class InstallShieldCABExtractor : IFolder
 	{
 		const uint FileSplit = 0x1;
 		const uint FileObfuscated = 0x2;

OpenRA.Game/GlobalChat.cs

@@ -66,7 +66,7 @@ namespace OpenRA.Chat
 		}
 	}
 
-	public class GlobalChat : IDisposable
+	public sealed class GlobalChat : IDisposable
 	{
 		readonly IrcClient client = new IrcClient();
 		volatile Channel channel;

OpenRA.Game/Graphics/HardwareCursor.cs

@@ -17,7 +17,7 @@ using OpenRA.Primitives;
 
 namespace OpenRA.Graphics
 {
-	public class HardwareCursor : ICursor
+	public sealed class HardwareCursor : ICursor
 	{
 		readonly Dictionary<string, IHardwareCursor[]> hardwareCursors = new Dictionary<string, IHardwareCursor[]>();
 		readonly CursorProvider cursorProvider;

OpenRA.Game/Graphics/SoftwareCursor.cs

@@ -24,7 +24,7 @@ namespace OpenRA.Graphics
 		void Tick();
 	}
 
-	public class SoftwareCursor : ICursor
+	public sealed class SoftwareCursor : ICursor
 	{
 		readonly HardwarePalette palette = new HardwarePalette();
 		readonly Cache<string, PaletteReference> paletteReferences;

OpenRA.Game/Graphics/SpriteFont.cs

@@ -17,7 +17,7 @@ using SharpFont;
 
 namespace OpenRA.Graphics
 {
-	public class SpriteFont
+	public sealed class SpriteFont : IDisposable
 	{
 		static readonly Library Library = new Library();
 
@@ -150,6 +150,11 @@ namespace OpenRA.Graphics
 
 			return g;
 		}
+
+		public void Dispose()
+		{
+			face.Dispose();
+		}
 	}
 
 	class GlyphInfo

OpenRA.Game/Renderer.cs

@@ -91,6 +91,9 @@ namespace OpenRA
 
 		public void InitializeFonts(Manifest m)
 		{
+			if (Fonts != null)
+				foreach (var font in Fonts.Values)
+					font.Dispose();
 			using (new Support.PerfTimer("SpriteFonts"))
 			{
 				if (fontSheetBuilder != null)
@@ -254,6 +257,9 @@ namespace OpenRA
 			tempBuffer.Dispose();
 			if (fontSheetBuilder != null)
 				fontSheetBuilder.Dispose();
+			if (Fonts != null)
+				foreach (var font in Fonts.Values)
+					font.Dispose();
 		}
 
 		public string GetClipboardText()

OpenRA.Mods.Cnc/CncLoadScreen.cs

@@ -124,12 +124,12 @@ namespace OpenRA.Mods.Cnc
 			r.EndFrame(nih);
 		}
 
-		public override void Dispose()
+		protected override void Dispose(bool disposing)
 		{
-			if (sheet != null)
+			if (disposing && sheet != null)
 				sheet.Dispose();
 
-			base.Dispose();
+			base.Dispose(disposing);
 		}
 	}
 }

OpenRA.Mods.Common/LoadScreens/BlankLoadScreen.cs

@@ -90,6 +90,12 @@ namespace OpenRA.Mods.Common.LoadScreens
 			Game.Settings.Save();
 		}
 
-		public virtual void Dispose() { }
+		protected virtual void Dispose(bool disposing) { }
+
+		public void Dispose()
+		{
+			Dispose(true);
+			GC.SuppressFinalize(this);
+		}
 	}
 }

OpenRA.Mods.Common/LoadScreens/LogoStripeLoadScreen.cs

@@ -79,12 +79,12 @@ namespace OpenRA.Mods.Common.LoadScreens
 			r.EndFrame(new NullInputHandler());
 		}
 
-		public override void Dispose()
+		protected override void Dispose(bool disposing)
 		{
-			if (sheet != null)
+			if (disposing && sheet != null)
 				sheet.Dispose();
 
-			base.Dispose();
+			base.Dispose(disposing);
 		}
 	}
 }

OpenRA.Mods.Common/Widgets/RadarWidget.cs

@@ -19,7 +19,7 @@ using OpenRA.Widgets;
 
 namespace OpenRA.Mods.Common.Widgets
 {
-	public class RadarWidget : Widget
+	public sealed class RadarWidget : Widget, IDisposable
 	{
 		public string WorldInteractionController = null;
 		public int AnimationLength = 5;
@@ -447,6 +447,12 @@ namespace OpenRA.Mods.Common.Widgets
 			base.Removed();
 			world.Map.MapTiles.Value.CellEntryChanged -= UpdateTerrainCell;
 			world.Map.CustomTerrain.CellEntryChanged -= UpdateTerrainCell;
+			Dispose();
+		}
+
+		public void Dispose()
+		{
+			radarSheet.Dispose();
 		}
 	}
 }

OpenRA.Platforms.Default/OpenAlSoundEngine.cs

@@ -304,15 +304,26 @@ namespace OpenRA.Platforms.Default
 			AL10.alListenerf(EFX.AL_METERS_PER_UNIT, .01f);
 		}
 
+		~OpenAlSoundEngine()
+		{
+			Game.RunAfterTick(() => Dispose(false));
+		}
+
 		public void Dispose()
 		{
-			if (device == IntPtr.Zero)
-				return;
+			Game.RunAfterTick(() => Dispose(true));
+			GC.SuppressFinalize(this);
+		}
 
+		void Dispose(bool disposing)
+		{
+			if (device != IntPtr.Zero)
+			{
 				ALC10.alcCloseDevice(device);
 				device = IntPtr.Zero;
 			}
 		}
+	}
 
 	class OpenAlSoundSource : ISoundSource
 	{