[gtk/wip/chergert/gdk-macos-for-master] macos: track grab serial like other backends

[Christian Hergert <chergert src gnome org>]

commit 26b9254ac768593cb772a9a84b5f2823c69bd624
Author: Christian Hergert <chergert redhat com>
Date:   Wed Dec 2 11:34:31 2020 -0800

    macos: track grab serial like other backends
    
    This is what is done elsewhere, so copy that here too now that we actually
    generate serials for events.

 gdk/macos/gdkmacosdevice.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gdk/macos/gdkmacosdevice.c b/gdk/macos/gdkmacosdevice.c
index 5c97d24799..adc58be7f6 100644
--- a/gdk/macos/gdkmacosdevice.c
+++ b/gdk/macos/gdkmacosdevice.c
@@ -122,7 +122,7 @@ gdk_macos_device_ungrab (GdkDevice *device,
   grab = _gdk_display_get_last_device_grab (display, device);
 
   if (grab != NULL)
-    grab->serial_end = 0;
+    grab->serial_end = grab->serial_start;
 
   _gdk_display_device_grab_update (display, device, 0);
 }