From ec7ae1fefb8cbe3fae2d228981cec7132dddc0e0 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Thu, 1 Oct 2020 10:45:33 +0100
Subject: [PATCH] [TreeView] dont raise change events on the clear stage of
 setting a single selection.

---
 src/Avalonia.Controls/TreeView.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Controls/TreeView.cs b/src/Avalonia.Controls/TreeView.cs
index b4c30e0149..b9e30620bc 100644
--- a/src/Avalonia.Controls/TreeView.cs
+++ b/src/Avalonia.Controls/TreeView.cs
@@ -219,7 +219,9 @@ namespace Avalonia.Controls
 
         private void SelectSingleItem(object item)
         {
+            _syncingSelectedItems = true;
             SelectedItems.Clear();
+            _syncingSelectedItems = false;
             SelectedItems.Add(item);
         }
 
@@ -353,7 +355,7 @@ namespace Avalonia.Controls
                 MarkItemSelected(item, true);
             }
 
-            if (SelectedItem == null && !_syncingSelectedItems)
+            if (!_syncingSelectedItems)
             {
                 SetAndRaise(SelectedItemProperty, ref _selectedItem, items[0]);
             }