pub unsafe extern "C" fn gdk_wayland_window_export_handle(
    window: *mut GdkWaylandWindow,
    cb: Option<unsafe extern "C" fn(_: *mut GdkWaylandWindow, _: *const c_char, _: *mut c_void)>,
    user_data: *mut c_void,
    destroy_notify: Option<unsafe extern "C" fn(_: *mut c_void)>
) -> gboolean