Fix rcol group pasting

Author: kagenocookie

ContentEditor.App/AppImguiHelpers.cs

@@ -201,26 +201,35 @@ public static bool JsonCopyableTreeNode<T>(UIContext context, JsonSerializerOpti
     }
 
     public static bool CopyableTreeNode<T>(UIContext context) where T : class
+    {
+        return CopyableTreeNode<T>(context, out _);
+    }
+
+    public static bool CopyableTreeNode<T>(UIContext context, out bool didPaste) where T : class
     {
         var instance = context.Get<T>()!;
         var show = ImguiHelpers.TreeNodeSuffix(context.label, instance.ToString() ?? "NULL");
         if (ImGui.BeginPopupContextItem(context.label)) {
-            ShowVirtualCopyPopupButtons<T>(instance, context);
+            didPaste = ShowVirtualCopyPopupButtons<T>(instance, context);
             ImGui.EndPopup();
+        } else {
+            didPaste = false;
         }
         return show;
     }
 
-    public static void ShowVirtualCopyPopupButtons<T>(UIContext context) where T : class => ShowVirtualCopyPopupButtons<T>(context.Get<T>(), context);
-    public static void ShowVirtualCopyPopupButtons<T>(T target, UIContext context) where T : class
+    public static bool ShowVirtualCopyPopupButtons<T>(UIContext context) where T : class => ShowVirtualCopyPopupButtons<T>(context.Get<T>(), context);
+    public static bool ShowVirtualCopyPopupButtons<T>(T target, UIContext context) where T : class
     {
         if (ImGui.Selectable("Copy")) {
             VirtualClipboard.CopyToClipboard(target.DeepCloneGeneric<T>());
         }
         if (VirtualClipboard.TryGetFromClipboard<T>(out var newClip) && ImGui.Selectable("Paste (replace)")) {
             UndoRedo.RecordSet(context, newClip.DeepCloneGeneric<T>());
             context.ClearChildren();
+            return true;
         }
+        return false;
     }
 
     private static IList? _dragDropSourceList;

ContentEditor.App/Imgui/Editors/RcolEditor.cs

@@ -303,10 +303,18 @@ public void OnIMGUI(UIContext context)
             context.AddChild<RcolGroup, List<RcolShape>>("ExtraShapes", group, new ListHandler(typeof(RcolShape)) { CanCreateRemoveElements = true }, getter: (i) => i!.ExtraShapes);
         }
 
-        if (AppImguiHelpers.CopyableTreeNode<RcolGroup>(context)) {
+        if (AppImguiHelpers.CopyableTreeNode<RcolGroup>(context, out var pasted)) {
             context.ShowChildrenUI();
             ImGui.TreePop();
         }
+
+        if (pasted) {
+            var group = context.Get<RcolGroup>();
+            var rcol = context.FindHandlerInParents<RcolEditor>();
+            if (rcol != null && !rcol.File.Groups.Contains(group)) {
+                rcol.File.Groups.Add(group);
+            }
+        }
     }
 }