From bdcb8138fe5549071eb3339ced67180b00bafb5f Mon Sep 17 00:00:00 2001
From: Ken Thomases <ken@codeweavers.com>
Date: Tue, 8 Oct 2013 02:21:27 -0500
Subject: [PATCH] winemac: Don't accidentally clear Cocoa window style mask
 bits.

---
 dlls/winemac.drv/cocoa_window.m | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dlls/winemac.drv/cocoa_window.m b/dlls/winemac.drv/cocoa_window.m
index ede86d51453..9b3fa9d1b81 100644
--- a/dlls/winemac.drv/cocoa_window.m
+++ b/dlls/winemac.drv/cocoa_window.m
@@ -569,8 +569,10 @@ - (void) adjustFeaturesForState
 
     - (void) setWindowFeatures:(const struct macdrv_window_features*)wf
     {
+        static const NSUInteger usedStyles = NSTitledWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask |
+                                             NSResizableWindowMask | NSUtilityWindowMask | NSBorderlessWindowMask;
         NSUInteger currentStyle = [self styleMask];
-        NSUInteger newStyle = style_mask_for_features(wf);
+        NSUInteger newStyle = style_mask_for_features(wf) | (currentStyle & ~usedStyles);
 
         if (newStyle != currentStyle)
         {