fix derived list/extensions for moverange

7 years ago · aa21fe9d17
1 changed files with 6 additions and 1 deletions
--- a/src/Avalonia.Base/Collections/AvaloniaListExtensions.cs
+++ b/src/Avalonia.Base/Collections/AvaloniaListExtensions.cs
@ -104,7 +104,12 @@ namespace Avalonia.Collections
                    case NotifyCollectionChangedAction.Move:
                    case NotifyCollectionChangedAction.Replace:
                        Remove(e.OldStartingIndex, e.OldItems);
-                        Add(e.NewStartingIndex, e.NewItems);
+                        int newIndex = e.NewStartingIndex;
+                        if(newIndex > e.OldStartingIndex)
+                        {
+                            newIndex -= e.OldItems.Count;
+                        }
+                        Add(newIndex, e.NewItems);
                        break;

                    case NotifyCollectionChangedAction.Remove: