From 7354ba337a3b7883878735f4eb21995b7e53760a Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Mon, 2 Nov 2020 18:50:27 +0100
Subject: [PATCH] Use as instead of cast.

In case someone's doing something funky, fail gracefully.
---
 src/Avalonia.Input/KeyboardDevice.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Avalonia.Input/KeyboardDevice.cs b/src/Avalonia.Input/KeyboardDevice.cs
index 099fc74766..1a161ae56a 100644
--- a/src/Avalonia.Input/KeyboardDevice.cs
+++ b/src/Avalonia.Input/KeyboardDevice.cs
@@ -98,7 +98,7 @@ namespace Avalonia.Input
                     break;
                 }
 
-                el = (IInputElement)el.VisualParent;
+                el = el.VisualParent as IInputElement;
             }
 
             el = oldElement;
@@ -117,8 +117,8 @@ namespace Avalonia.Input
                     ie.IsKeyboardFocusWithin = true;
                 }
 
-                el = (IInputElement)el.VisualParent;
-            }    
+                el = el.VisualParent as IInputElement;
+            }
         }
         
         private void ClearChildrenFocusWithin(IInputElement element, bool clearRoot)