macos: restore unfullscreen frame with style mask

This doesn't give us appropriate results if we use the window delegate.
Instead, we need to adjust the frame at the same time we change the
style mask so that we end up in the same location.

gdk/macos/GdkMacosWindow.c

@@ -668,7 +668,12 @@ typedef NSString *CALayerContentsGravity;
   is_opaque = (([self styleMask] & NSWindowStyleMaskTitled) != 0);
 
   if (was_fullscreen != is_fullscreen)
-    _gdk_macos_surface_update_fullscreen_state (gdk_surface);
+    {
+      if (was_fullscreen)
+        [self setFrame:lastUnfullscreenFrame display:NO];
+
+      _gdk_macos_surface_update_fullscreen_state (gdk_surface);
+    }
 
   if (was_opaque != is_opaque)
     {
@@ -753,7 +758,6 @@ typedef NSString *CALayerContentsGravity;
 
 -(void)windowWillExitFullScreen:(NSNotification *)aNotification
 {
-  [self setFrame:lastUnfullscreenFrame display:NO];
 }
 
 -(void)windowDidExitFullScreen:(NSNotification *)aNotification