Fix Selection after Delete in WPF Designer

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Extensions/DefaultPlacementBehavior.cs

@@ -63,9 +63,12 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 		{
 			InfoTextEnterArea.Stop(ref infoTextEnterArea);
 
+			if (operation.Type != PlacementType.Delete)
+			{
 				this.ExtendedItem.Services.Selection.SetSelectedComponents(null);
 				this.ExtendedItem.Services.Selection.SetSelectedComponents(operation.PlacedItems.Select(x => x.Item).ToList());
 			}
+		}
 
 		public virtual Rect GetPosition(PlacementOperation operation, DesignItem item)
 		{