From ce3c8316b5cd90db1e293e7cb4bf4a97cae8c823 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Tue, 6 Oct 2020 10:46:15 +0200
Subject: [PATCH] Don't invalidate ItemsRepeater measure on children change.

---
 src/Avalonia.Controls/Panel.cs                  | 5 +++++
 src/Avalonia.Controls/Repeater/ItemsRepeater.cs | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/src/Avalonia.Controls/Panel.cs b/src/Avalonia.Controls/Panel.cs
index ccb92dc497..b7eeb065da 100644
--- a/src/Avalonia.Controls/Panel.cs
+++ b/src/Avalonia.Controls/Panel.cs
@@ -137,6 +137,11 @@ namespace Avalonia.Controls
                     throw new NotSupportedException();
             }
 
+            InvalidateMeasureOnChildrenChanged();
+        }
+
+        private protected virtual void InvalidateMeasureOnChildrenChanged()
+        {
             InvalidateMeasure();
         }
 
diff --git a/src/Avalonia.Controls/Repeater/ItemsRepeater.cs b/src/Avalonia.Controls/Repeater/ItemsRepeater.cs
index 40f1b8dbb9..9ed09df7db 100644
--- a/src/Avalonia.Controls/Repeater/ItemsRepeater.cs
+++ b/src/Avalonia.Controls/Repeater/ItemsRepeater.cs
@@ -267,6 +267,11 @@ namespace Avalonia.Controls
             return result;
         }
 
+        private protected override void InvalidateMeasureOnChildrenChanged()
+        {
+            // Don't invalidate measure when children change.
+        }
+
         protected override Size MeasureOverride(Size availableSize)
         {
             if (_isLayoutInProgress)