From 09297dbb089110c2c70c675eb4b671d10834ef46 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Thu, 9 Jan 2020 10:37:44 +0100
Subject: [PATCH] Fix repeater holding onto elements

If a consumer changes the ItemsSource with a non recycling layout then the items from the old source would be perpetually held by repeater, a potentially substantial leak.

Ported from https://github.com/microsoft/microsoft-ui-xaml/commit/e158eec3e93f7c3839f5a9e5226f0f4e0103f2a6
---
 src/Avalonia.Controls/Repeater/ItemsRepeater.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Avalonia.Controls/Repeater/ItemsRepeater.cs b/src/Avalonia.Controls/Repeater/ItemsRepeater.cs
index 0e2136a6f3..685d3e44f2 100644
--- a/src/Avalonia.Controls/Repeater/ItemsRepeater.cs
+++ b/src/Avalonia.Controls/Repeater/ItemsRepeater.cs
@@ -588,6 +588,8 @@ namespace Avalonia.Controls
                             ClearElementImpl(element);
                         }
                     }
+
+                    Children.Clear();
                 }
 
                 InvalidateMeasure();