Added Undo Redo to editor

OpenRA.Mods.Common/Widgets/EditorViewportControllerWidget.cs

@@ -11,6 +11,7 @@
 
 using System;
 using OpenRA.Graphics;
+using OpenRA.Mods.Common.Traits;
 using OpenRA.Widgets;
 
 namespace OpenRA.Mods.Common.Widgets
@@ -25,6 +26,7 @@ namespace OpenRA.Mods.Common.Widgets
 
 		readonly Lazy<TooltipContainerWidget> tooltipContainer;
 		readonly WorldRenderer worldRenderer;
+		readonly EditorActionManager editorActionManager;
 
 		bool enableTooltips;
 
@@ -34,6 +36,14 @@ namespace OpenRA.Mods.Common.Widgets
 			this.worldRenderer = worldRenderer;
 			tooltipContainer = Exts.Lazy(() => Ui.Root.Get<TooltipContainerWidget>(TooltipContainer));
 			CurrentBrush = DefaultBrush = new EditorDefaultBrush(this, worldRenderer);
+			editorActionManager = world.WorldActor.Trait<EditorActionManager>();
+
+			editorActionManager.OnChange += EditorActionManagerOnChange;
+		}
+
+		void EditorActionManagerOnChange()
+		{
+			DefaultBrush.SelectedActor = null;
 		}
 
 		public void ClearBrush() { SetBrush(null); }
@@ -109,5 +119,11 @@ namespace OpenRA.Mods.Common.Widgets
 			cachedViewportPosition = worldRenderer.Viewport.CenterPosition;
 			CurrentBrush.Tick();
 		}
+
+		public override void Removed()
+		{
+			base.Removed();
+			editorActionManager.OnChange -= EditorActionManagerOnChange;
+		}
 	}
 }