fix fix

sandbox/ConsoleApp/Program.cs

@@ -8,11 +8,14 @@
 
 
 var dict = new ObservableDictionary<int, string>();
-var view = dict.CreateView(x => x).ToNotifyCollectionChanged();
+var view = dict.CreateView(x => x);
+view.AttachFilter(x => x.Key == 1);
+
+var view2 = view.ToNotifyCollectionChanged();
 dict.Add(key: 1, value: "foo");
 dict.Add(key: 2, value: "bar");
 
-foreach (var item in view)
+foreach (var item in view2)
 {
     Console.WriteLine(item);
 }

src/ObservableCollections/SynchronizedViewList.cs

@@ -197,6 +197,8 @@ private void Parent_ViewChanged(in SynchronizedViewChangedEventArgs<T, TView> e)
 
     private void Parent_RejectedViewChanged(RejectedViewChangedAction arg1, int index, int oldIndex)
     {
+        if (index == -1) return;
+
         lock (gate)
         {
             switch (arg1)
@@ -208,6 +210,7 @@ private void Parent_RejectedViewChanged(RejectedViewChangedAction arg1, int inde
                     listView.UpdateAlternateIndex(index, -1);
                     break;
                 case RejectedViewChangedAction.Move:
+                    if (oldIndex == -1) return;
                     listView.TryReplaceAlternateIndex(oldIndex, index);
                     break;
                 default:
@@ -270,7 +273,7 @@ internal class NonFilteredSynchronizedViewList<T, TView> : ISynchronizedViewList
     readonly ISynchronizedView<T, TView> parent;
     protected readonly List<TView> listView; // no filter can be faster
     protected readonly object gate = new object();
-    
+
     protected virtual bool IsSupportRangeFeature => true;
 
     public NonFilteredSynchronizedViewList(ISynchronizedView<T, TView> parent)