Function xcb::ffi::xproto::xcb_ungrab_key_checked

pub unsafe extern "C" fn xcb_ungrab_key_checked(
    c: *mut xcb_connection_t, 
    key: xcb_keycode_t, 
    grab_window: xcb_window_t, 
    modifiers: u16
) -> xcb_void_cookie_t

release a key combination

Releases the key combination on grab_window if you grabbed it using xcb_grab_key before.