Copy & Paste of Items -> Keep the old Position, don't move all Elements to the upper corner.

This works, because before the Action was AddItem, and then the DefaultPlacementBehavior tries to set the position!
This should not be done by paste from Clipboard

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Xaml/XamlEditOperations.cs

@@ -161,7 +161,7 @@ namespace ICSharpCode.WpfDesign.Designer.Xaml
 		void AddInParent(DesignItem parent,IList<DesignItem> pastedItems)
 		{
 			IEnumerable<Rect> rects = pastedItems.Select(i => new Rect(new Point(0, 0), new Point((double)i.Properties["Width"].ValueOnInstance, (double)i.Properties["Height"].ValueOnInstance)));
-			var operation = PlacementOperation.TryStartInsertNewComponents(parent, pastedItems, rects.ToList(), PlacementType.AddItem);
+			var operation = PlacementOperation.TryStartInsertNewComponents(parent, pastedItems, rects.ToList(), PlacementType.PasteItem);
 			ISelectionService selection = _context.Services.Selection;
 			selection.SetSelectedComponents(pastedItems);
 			if(operation!=null)

src/AddIns/DisplayBindings/WpfDesign/WpfDesign/Project/PlacementType.cs

@@ -35,6 +35,12 @@ namespace ICSharpCode.WpfDesign
 		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes")]
 		public static readonly PlacementType Delete = Register("Delete");
 		
+		/// <summary>
+        /// Inserting from Cliboard
+        /// </summary>
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes")]
+        public static readonly PlacementType PasteItem = Register("PasteItem");
+
 		readonly string name;
 		
 		private PlacementType(string name)