[PATCH] winemac: Only manipulate an NSOpenGLContext's view on the main thread.

[Chip Davis]

From: Ken Thomases

I was seeing a crash due to an assert about manipulating it on a
background thread. I can't recall where I was seeing that. I think it's
new in Catalina.

Signed-off-by: Chip Davis 
---
Chip's notes: I have also seen this on Mojave.

dlls/winemac.drv/cocoa_opengl.m | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/dlls/winemac.drv/cocoa_opengl.m b/dlls/winemac.drv/cocoa_opengl.m
index 5a097a12d26..e60b0b388b8 100644
--- a/dlls/winemac.drv/cocoa_opengl.m
+++ b/dlls/winemac.drv/cocoa_opengl.m
@@ -79,8 +79,10 @@ - (void) resetSurfaceIfBackingSizeChanged
             macdrv_set_view_backing_size((macdrv_view)self.view, view_backing);

NSView* save = self.view;
-            [super clearDrawable];
-            [super setView:save];
+            OnMainThread(^{
+                [super clearDrawable];
+                [super setView:save];
+            });
             shouldClearToBlack = TRUE;
         }
     }
@@ -122,7 +124,11 @@ - (void) wine_updateBackingSize:(const CGSize*)size
     - (void) setView:(NSView*)newView
     {
         NSView* oldView = [self view];
-        [super setView:newView];
+        if ([NSThread isMainThread])
+            [super setView:newView];
+        else OnMainThread(^{
+            [super setView:newView];
+        });
         [newView retain];
         [oldView release];
     }
@@ -130,7 +136,11 @@ - (void) setView:(NSView*)newView
     - (void) clearDrawable
     {
         NSView* oldView = [self view];
-        [super clearDrawable];
+        if ([NSThread isMainThread])
+            [super clearDrawable];
+        else OnMainThread(^{
+            [super clearDrawable];
+        });
         [oldView release];

[self wine_updateBackingSize:NULL];