}
	if (!c) {
		wlr_seat_keyboard_clear_focus(seat);
		return;

	/* Move the client to the front of the focus stack */
	wl_list_remove(&c->flink);
	wl_list_insert(&fstack, &c->flink);
	/* Activate the new surface */
	wlr_xdg_toplevel_set_activated(c->xdg_surface, true);

	 * your part.

	 * your part.  If surface == NULL, this will clear focus.

	wlr_seat_keyboard_notify_enter(seat, c->xdg_surface->surface,
		kb->keycodes, kb->num_keycodes, &kb->modifiers);

	wlr_seat_keyboard_notify_enter(seat, surface,
			kb->keycodes, kb->num_keycodes, &kb->modifiers);
	if (c) {
		/* Move the client to the front of the focus stack */
		wl_list_remove(&c->flink);
		wl_list_insert(&fstack, &c->flink);
		/* Activate the new surface */
		wlr_xdg_toplevel_set_activated(c->xdg_surface, true);
	}