Since I'm not in the list, pls. reply to me directlly.
Sorry for post twice.
From the source code of gtk_grab_get_current(), it only search grab
with gtk_window_group value NULL. What will return if I create two
window groups and each has a grab widget only applied in that group?
I do met a sample code that just after gtk_grab_add is called
successfully, gtk_grab_get_current returns NULL.