From 72beb30f025bf4b808a0bfd59d7ba603c883dc0f Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Fri, 28 Jan 2022 23:04:08 +0100
Subject: [PATCH] Cast to interface instead of concrete type.

`PlatformImpl` may be a `ValidatingTopLevelImpl`.
---
 src/Windows/Avalonia.Win32/Automation/RootAutomationNode.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Windows/Avalonia.Win32/Automation/RootAutomationNode.cs b/src/Windows/Avalonia.Win32/Automation/RootAutomationNode.cs
index 435e0671df..8c7dfb5de2 100644
--- a/src/Windows/Avalonia.Win32/Automation/RootAutomationNode.cs
+++ b/src/Windows/Avalonia.Win32/Automation/RootAutomationNode.cs
@@ -2,6 +2,7 @@
 using System.Runtime.InteropServices;
 using Avalonia.Automation.Peers;
 using Avalonia.Automation.Provider;
+using Avalonia.Platform;
 using Avalonia.Win32.Interop.Automation;
 
 #nullable enable
@@ -21,7 +22,7 @@ namespace Avalonia.Win32.Automation
 
         public override IRawElementProviderFragmentRoot? FragmentRoot => this;
         public new IRootProvider Peer { get; }
-        public WindowImpl? WindowImpl => Peer.PlatformImpl as WindowImpl;
+        public IWindowImpl? WindowImpl => Peer.PlatformImpl as IWindowImpl;
         
         public IRawElementProviderFragment? ElementProviderFromPoint(double x, double y)
         {