From 412d50a9bfdbc12d5cafd51981c2bedad2931164 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Fri, 24 Dec 2021 17:05:26 +0100
Subject: [PATCH] Don't allocate ChildIndexChangedEventArgs if not needed.

---
 src/Avalonia.Controls/Panel.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Avalonia.Controls/Panel.cs b/src/Avalonia.Controls/Panel.cs
index dfc87a64ff..fce588f8ca 100644
--- a/src/Avalonia.Controls/Panel.cs
+++ b/src/Avalonia.Controls/Panel.cs
@@ -108,14 +108,14 @@ namespace Avalonia.Controls
         /// </summary>
         protected internal virtual void InvalidateOnChildrenChanged()
         {
-            OnChildIndexChanged(new ChildIndexChangedEventArgs());
+            OnChildIndexChanged();
             InvalidateMeasure();
             VisualRoot?.Renderer?.RecalculateChildren(this);
         }
 
-        protected void OnChildIndexChanged(ChildIndexChangedEventArgs e)
+        protected void OnChildIndexChanged(ILogical changed = null)
         {
-            _childIndexChanged?.Invoke(this, e);
+            _childIndexChanged?.Invoke(this, new ChildIndexChangedEventArgs(changed));
         }
 
         private static void AffectsParentArrangeInvalidate<TPanel>(AvaloniaPropertyChangedEventArgs e)