From c9bb9f2c010a0be39fdcbeb0f4a788d20712a8a1 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Tue, 14 Feb 2023 12:04:50 +0100
Subject: [PATCH] Don't add duplicate logical children.

---
 src/Avalonia.Controls/ItemsControl.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Controls/ItemsControl.cs b/src/Avalonia.Controls/ItemsControl.cs
index 2f02a48d55..ce12d5f2bf 100644
--- a/src/Avalonia.Controls/ItemsControl.cs
+++ b/src/Avalonia.Controls/ItemsControl.cs
@@ -559,7 +559,12 @@ namespace Avalonia.Controls
             return new ItemContainerGenerator(this);
         }
 
-        internal void AddLogicalChild(Control c) => LogicalChildren.Add(c);
+        internal void AddLogicalChild(Control c)
+        {
+            if (!LogicalChildren.Contains(c))
+                LogicalChildren.Add(c);
+        }
+
         internal void RemoveLogicalChild(Control c) => LogicalChildren.Remove(c);
 
         /// <summary>