From aa21fe9d17da5593ffbb81c3600a0dd8e36b1ca9 Mon Sep 17 00:00:00 2001
From: Andrey Kunchev <donandren@gmail.com>
Date: Wed, 31 Oct 2018 19:57:31 +0200
Subject: [PATCH] fix derived list/extensions for moverange

---
 src/Avalonia.Base/Collections/AvaloniaListExtensions.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Base/Collections/AvaloniaListExtensions.cs b/src/Avalonia.Base/Collections/AvaloniaListExtensions.cs
index 1731950222..58f3413780 100644
--- 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: