Make brush rendering self-contained

OpenRA.Mods.Common/UpdateRules/Rules/20231010/MovePreviewFacing.cs

@@ -0,0 +1,42 @@
+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class MovePreviewFacing : UpdateRule
+	{
+		public override string Name => "Move map editor preview facing to EditorActorLayer";
+
+		public override string Description =>
+			"PreviewFacing property was moved from the EditorCursorLayer to the EditorActorLayer.";
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNodeBuilder actorNode)
+		{
+			var cursorLayer = actorNode.LastChildMatching("EditorCursorLayer");
+			if (cursorLayer == null || cursorLayer.IsRemoval())
+				yield break;
+
+			var node = cursorLayer.LastChildMatching("PreviewFacing");
+			cursorLayer.RemoveNodes("PreviewFacing");
+			if (node == null || node.IsRemoval())
+				yield break;
+
+			var actorLayer = actorNode.LastChildMatching("EditorActorLayer");
+			if (actorLayer != null && !actorLayer.IsRemoval())
+			{
+				node.RenameKey("DefaultActorFacing");
+				actorLayer.AddNode(node);
+			}
+		}
+	}
+}