Fix order when pasting UI Controls

#487

Source/Editor/SceneGraph/ActorNode.cs

@@ -288,6 +288,13 @@ namespace FlaxEditor.SceneGraph
         {
         }
 
+        /// <summary>
+        /// Action called after pasting actor in editor.
+        /// </summary>
+        public virtual void PostPaste()
+        {
+        }
+
         /// <inheritdoc />
         protected override void OnParentChanged()
         {

Source/Editor/SceneGraph/Actors/UIControlNode.cs

@@ -25,5 +25,20 @@ namespace FlaxEditor.SceneGraph.Actors
             if (Actor is UIControl uiControl)
                 DebugDraw.DrawWireBox(uiControl.Bounds, Color.BlueViolet);
         }
+
+        /// <inheritdoc />
+        public override void PostPaste()
+        {
+            base.PostPaste();
+
+            var control = ((UIControl)Actor).Control;
+            if (control != null)
+            {
+                if (control.Parent != null)
+                    control.Parent.PerformLayout();
+                else
+                    control.PerformLayout();
+            }
+        }
     }
 }

Source/Editor/Undo/Actions/PasteActorsAction.cs

@@ -140,22 +140,27 @@ namespace FlaxEditor.Actions
 
             for (int i = 0; i < nodeParents.Count; i++)
             {
-                // Fix name collisions (only for parents)
                 var node = nodeParents[i];
                 var parent = node.Actor?.Parent;
                 if (parent != null)
                 {
+                    // Fix name collisions
                     string name = node.Name;
                     Actor[] children = parent.Children;
                     if (children.Any(x => x.Name == name))
                     {
-                        // Generate new name
                         node.Actor.Name = StringUtils.IncrementNameNumber(name, x => children.All(y => y.Name != x));
                     }
                 }
 
                 Editor.Instance.Scene.MarkSceneEdited(node.ParentScene);
             }
+
+            for (int i = 0; i < nodeParents.Count; i++)
+            {
+                var node = nodeParents[i];
+                node.PostPaste();
+            }
         }
 
         /// <summary>