From 91525d09a95da15c7228b1bd606810144f989b1c Mon Sep 17 00:00:00 2001
From: Emmanuel Hansen <emmausssss@gmail.com>
Date: Tue, 30 Apr 2024 20:54:26 +0000
Subject: [PATCH] Win32 - Apply extend client state when window visibility
 changes (#15566)

* win32 - apply extend client state when window visibility changes

* only apply extend client if window is extended.
---
 src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs b/src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs
index 5a9d6363e0e..a8531088ebe 100644
--- a/src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs
+++ b/src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs
@@ -611,6 +611,11 @@ message switch
 
                 case WindowsMessage.WM_SHOWWINDOW:
                     _shown = wParam != default;
+
+                    if (_isClientAreaExtended)
+                    {
+                        ExtendClientArea();
+                    }
                     break;
 
                 case WindowsMessage.WM_SIZE: