macos: fix resize when using server-side decorations

If we are using NSWindow titled windows, we don't end up waking up the
frame clock when the window is resized on the display server. This ensures
that we do that after getting a notification of resize.

gdk/macos/GdkMacosWindow.c

@@ -380,6 +380,7 @@ typedef NSString *CALayerContentsGravity;
 -(void)windowDidResize:(NSNotification *)notification
 {
   _gdk_macos_surface_configure ([self gdkSurface]);
+  gdk_surface_request_layout (GDK_SURFACE (gdk_surface));
 }
 
 /* Used by gdkmacosdisplay-translate.c to decide if our sendEvent() handler