gdkKeyboardUngrab.
This overrides any previous keyboard grab by this client.gdkKeyboardGrab(window, owner.events = FALSE, time = "GDK_CURRENT_TIME")FALSE then all keyboard events are reported with respect to
window. If TRUE then keyboard events for this application are reported as
normal, but keyboard events outside this application are reported witGDK_CURRENT_TIME if no timestamp is
available.GdkGrabStatus] GDK_GRAB_SUCCESS if the grab was successful.