Make editor brushes disposable.

OpenRA.Mods.Common/EditorBrushes/EditorActorBrush.cs

@@ -24,7 +24,7 @@ using OpenRA.Widgets;
 
 namespace OpenRA.Mods.Common.Widgets
 {
-	public class EditorActorBrush : IEditorBrush
+	public sealed class EditorActorBrush : IEditorBrush
 	{
 		public readonly ActorInfo Actor;
 
@@ -148,5 +148,7 @@ namespace OpenRA.Mods.Common.Widgets
 			preview.Bounds.Width = (int)(zoom * s.X);
 			preview.Bounds.Height = (int)(zoom * s.Y);
 		}
+
+		public void Dispose() { }
 	}
 }

OpenRA.Mods.Common/EditorBrushes/EditorDefaultBrush.cs

@@ -24,13 +24,13 @@ using OpenRA.Widgets;
 
 namespace OpenRA.Mods.Common.Widgets
 {
-	public interface IEditorBrush
+	public interface IEditorBrush : IDisposable
 	{
 		bool HandleMouseInput(MouseInput mi);
 		void Tick();
 	}
 
-	public class EditorDefaultBrush : IEditorBrush
+	public sealed class EditorDefaultBrush : IEditorBrush
 	{
 		public readonly ActorInfo Actor;
 
@@ -110,5 +110,6 @@ namespace OpenRA.Mods.Common.Widgets
 		}
 
 		public void Tick() { }
+		public void Dispose() { }
 	}
 }

OpenRA.Mods.Common/EditorBrushes/EditorResourceBrush.cs

@@ -24,7 +24,7 @@ using OpenRA.Widgets;
 
 namespace OpenRA.Mods.Common.Widgets
 {
-	public class EditorResourceBrush : IEditorBrush
+	public sealed class EditorResourceBrush : IEditorBrush
 	{
 		public readonly ResourceTypeInfo ResourceType;
 
@@ -119,5 +119,7 @@ namespace OpenRA.Mods.Common.Widgets
 			preview.Bounds.X = cellScreenPixel.X;
 			preview.Bounds.Y = cellScreenPixel.Y;
 		}
+
+		public void Dispose() { }
 	}
 }

OpenRA.Mods.Common/EditorBrushes/EditorTileBrush.cs

@@ -24,7 +24,7 @@ using OpenRA.Widgets;
 
 namespace OpenRA.Mods.Common.Widgets
 {
-	public class EditorTileBrush : IEditorBrush
+	public sealed class EditorTileBrush : IEditorBrush
 	{
 		public readonly ushort Template;
 
@@ -156,5 +156,7 @@ namespace OpenRA.Mods.Common.Widgets
 			preview.Bounds.Width = (int)(zoom * bounds.Width);
 			preview.Bounds.Height = (int)(zoom * bounds.Height);
 		}
+
+		public void Dispose() { }
 	}
 }

OpenRA.Mods.Common/Widgets/EditorViewportControllerWidget.cs

@@ -48,6 +48,9 @@ namespace OpenRA.Mods.Common.Widgets
 		public void ClearBrush() { SetBrush(null); }
 		public void SetBrush(IEditorBrush brush)
 		{
+			if (CurrentBrush != null)
+				CurrentBrush.Dispose();
+
 			CurrentBrush = brush ?? defaultBrush;
 		}