From 315a7cf1a8a4a789e68405354838b438019f6354 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Sun, 6 Mar 2022 16:43:27 +0000
Subject: [PATCH] fix non-resizable window dragging with
 IsExtendedToClientDecorations.

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

diff --git a/src/Windows/Avalonia.Win32/WindowImpl.CustomCaptionProc.cs b/src/Windows/Avalonia.Win32/WindowImpl.CustomCaptionProc.cs
index 8a340aac5e..b97199d4de 100644
--- a/src/Windows/Avalonia.Win32/WindowImpl.CustomCaptionProc.cs
+++ b/src/Windows/Avalonia.Win32/WindowImpl.CustomCaptionProc.cs
@@ -23,7 +23,7 @@ namespace Avalonia.Win32
             AdjustWindowRectEx(ref rcFrame, (uint)(WindowStyles.WS_OVERLAPPEDWINDOW & ~WindowStyles.WS_CAPTION), false, 0);
 
             var borderThickness = new RECT();
-            if (GetStyle().HasAllFlags(WindowStyles.WS_THICKFRAME))
+            if (GetStyle().HasAllFlags(WindowStyles.WS_THICKFRAME) || _isClientAreaExtended)
             {
                 AdjustWindowRectEx(ref borderThickness, (uint)(GetStyle()), false, 0);
                 borderThickness.left *= -1;