From a3e02e3068e672aee79ceb75aa8d21d6d2e08d92 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Wed, 9 May 2018 22:57:26 +0100
Subject: [PATCH] restore correct implementation of SetSystemDecorations on
 Win32.

---
 src/Windows/Avalonia.Win32/WindowImpl.cs | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/src/Windows/Avalonia.Win32/WindowImpl.cs b/src/Windows/Avalonia.Win32/WindowImpl.cs
index cf6cb40e58..8637f30970 100644
--- a/src/Windows/Avalonia.Win32/WindowImpl.cs
+++ b/src/Windows/Avalonia.Win32/WindowImpl.cs
@@ -245,19 +245,13 @@ namespace Avalonia.Win32
                 return;
             }
 
-            var style = (UnmanagedMethods.WindowStyles)UnmanagedMethods.GetWindowLong(_hwnd, (int)UnmanagedMethods.WindowLongParam.GWL_STYLE);
-
-            var systemDecorationStyles = UnmanagedMethods.WindowStyles.WS_OVERLAPPED
-                | UnmanagedMethods.WindowStyles.WS_CAPTION
-                | UnmanagedMethods.WindowStyles.WS_SYSMENU
-                | UnmanagedMethods.WindowStyles.WS_MINIMIZEBOX
-                | UnmanagedMethods.WindowStyles.WS_MAXIMIZEBOX;
+            var style = (UnmanagedMethods.WindowStyles)UnmanagedMethods.GetWindowLong(_hwnd, (int)UnmanagedMethods.WindowLongParam.GWL_STYLE);            
 
-            style |= systemDecorationStyles;
+            style |= UnmanagedMethods.WindowStyles.WS_OVERLAPPEDWINDOW;
 
             if (!value)
             {
-                style ^= systemDecorationStyles;
+                style ^= UnmanagedMethods.WindowStyles.WS_OVERLAPPEDWINDOW;
             }
 
             UnmanagedMethods.RECT windowRect;