From b0bc7c21515e000154bd64da3494d0c0bd04544e Mon Sep 17 00:00:00 2001
From: neuecc <ils@neue.cc>
Date: Tue, 10 Sep 2024 01:07:15 +0900
Subject: [PATCH] fix ArgumentOutOfRangeException when using
 ToNotifyCollectionChanged with ObservableDictionary #70

---
 src/ObservableCollections/SynchronizedViewList.cs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/ObservableCollections/SynchronizedViewList.cs b/src/ObservableCollections/SynchronizedViewList.cs
index fedec6c..f1dc3a5 100644
--- a/src/ObservableCollections/SynchronizedViewList.cs
+++ b/src/ObservableCollections/SynchronizedViewList.cs
@@ -259,7 +259,14 @@ private void Parent_ViewChanged(in SynchronizedViewChangedEventArgs<T, TView> e)
                 case NotifyCollectionChangedAction.Add: // Add or Insert
                     if (e.IsSingleItem)
                     {
-                        listView.Insert(e.NewStartingIndex, e.NewItem.View);
+                        if (e.NewStartingIndex == -1)
+                        {
+                            listView.Add(e.NewItem.View);
+                        }
+                        else
+                        {
+                            listView.Insert(e.NewStartingIndex, e.NewItem.View);
+                        }
                     }
                     else
                     {