From 78f7726289cf8a002c36f33ac49153e33407528b Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Fri, 28 May 2021 17:09:14 +0200
Subject: [PATCH] Don't activate window when extending client area.

Fixes #5988
---
 src/Windows/Avalonia.Win32/WindowImpl.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Windows/Avalonia.Win32/WindowImpl.cs b/src/Windows/Avalonia.Win32/WindowImpl.cs
index 082aca1109..3a3342fd14 100644
--- a/src/Windows/Avalonia.Win32/WindowImpl.cs
+++ b/src/Windows/Avalonia.Win32/WindowImpl.cs
@@ -900,7 +900,7 @@ namespace Avalonia.Win32
                 IntPtr.Zero,
                 rcWindow.left, rcWindow.top,
                 rcClient.Width, rcClient.Height,
-                SetWindowPosFlags.SWP_FRAMECHANGED);
+                SetWindowPosFlags.SWP_FRAMECHANGED | SetWindowPosFlags.SWP_NOACTIVATE);
 
             if (_isClientAreaExtended && WindowState != WindowState.FullScreen)
             {