From e126874c80108e1e47c41cfafb1db9254dfcf256 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Mon, 4 Nov 2019 11:25:32 +0100
Subject: [PATCH] Handle cross-root reparenting.

When updating the scene for a window, moving a control to a different root should be the same as just removing the control.
---
 src/Avalonia.Visuals/Rendering/SceneGraph/SceneBuilder.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Avalonia.Visuals/Rendering/SceneGraph/SceneBuilder.cs b/src/Avalonia.Visuals/Rendering/SceneGraph/SceneBuilder.cs
index 558e96e132..1689f2e964 100644
--- a/src/Avalonia.Visuals/Rendering/SceneGraph/SceneBuilder.cs
+++ b/src/Avalonia.Visuals/Rendering/SceneGraph/SceneBuilder.cs
@@ -51,7 +51,7 @@ namespace Avalonia.Rendering.SceneGraph
                 UpdateSize(scene);
             }
 
-            if (visual.VisualRoot != null)
+            if (visual.VisualRoot == scene.Root.Visual)
             {
                 if (node?.Parent != null &&
                     visual.VisualParent != null &&