From 5b6a44bd724769dc287c5b829aba4be769ae9d13 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Wed, 7 Aug 2019 11:43:37 +0200
Subject: [PATCH] Fix facepalm in ItemsSourceView.

Don't construct a new `List` unless the source isn't already an `IList`.
---
 src/Avalonia.Controls/Repeater/ItemsSourceView.cs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/Avalonia.Controls/Repeater/ItemsSourceView.cs b/src/Avalonia.Controls/Repeater/ItemsSourceView.cs
index 732ba8501c..02ead7ef36 100644
--- a/src/Avalonia.Controls/Repeater/ItemsSourceView.cs
+++ b/src/Avalonia.Controls/Repeater/ItemsSourceView.cs
@@ -35,9 +35,11 @@ namespace Avalonia.Controls
         {
             Contract.Requires<ArgumentNullException>(source != null);
 
-            _inner = source as IList;
-
-            if (_inner == null && source is IEnumerable<object> objectEnumerable)
+            if (source is IList list)
+            {
+                _inner = list;
+            }
+            else if (source is IEnumerable<object> objectEnumerable)
             {
                 _inner = new List<object>(objectEnumerable);
             }