From 27b2b2733001b3aeee68264d67d8479447fb5aa0 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@users.noreply.github.com>
Date: Fri, 24 Mar 2023 18:14:46 +0100
Subject: [PATCH] Make ExpandSubTree work again.

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

diff --git a/src/Avalonia.Controls/TreeView.cs b/src/Avalonia.Controls/TreeView.cs
index 8f2636a783..1a9042a25b 100644
--- a/src/Avalonia.Controls/TreeView.cs
+++ b/src/Avalonia.Controls/TreeView.cs
@@ -10,6 +10,7 @@ using Avalonia.Controls.Generators;
 using Avalonia.Controls.Primitives;
 using Avalonia.Input;
 using Avalonia.Input.Platform;
+using Avalonia.Layout;
 using Avalonia.Threading;
 using Avalonia.VisualTree;
 
@@ -163,6 +164,9 @@ namespace Avalonia.Controls
         {
             item.IsExpanded = true;
 
+            if (item.Presenter?.Panel is null)
+                (this.GetVisualRoot() as ILayoutRoot)?.LayoutManager.ExecuteLayoutPass();
+
             if (item.Presenter?.Panel is { } panel)
             {
                 foreach (var child in panel.Children)