From 26a74c664d6d4d16224f1ecc7461fd02e09645d8 Mon Sep 17 00:00:00 2001
From: Ken Thomases <ken@codeweavers.com>
Date: Thu, 4 Apr 2013 14:26:01 -0500
Subject: [PATCH] winemac: Tell Cocoa to preserve our window content during
 live resizing.

---
 dlls/winemac.drv/cocoa_window.m | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/dlls/winemac.drv/cocoa_window.m b/dlls/winemac.drv/cocoa_window.m
index 43be348d015..99111953c26 100644
--- a/dlls/winemac.drv/cocoa_window.m
+++ b/dlls/winemac.drv/cocoa_window.m
@@ -277,6 +277,18 @@ - (BOOL) acceptsFirstMouse:(NSEvent*)theEvent
         return YES;
     }
 
+    - (BOOL) preservesContentDuringLiveResize
+    {
+        // Returning YES from this tells Cocoa to keep our view's content during
+        // a Cocoa-driven resize.  In theory, we're also supposed to override
+        // -setFrameSize: to mark exposed sections as needing redisplay, but
+        // user32 will take care of that in a roundabout way.  This way, we don't
+        // redraw until the window surface is flushed.
+        //
+        // This doesn't do anything when we resize the window ourselves.
+        return YES;
+    }
+
 @end