wlr_pointer_gestures_v1: emit destroy signal in destroy function

types/wlr_pointer_gestures_v1.c

@@ -396,6 +396,7 @@ static void pointer_gestures_v1_bind(struct wl_client *wl_client, void *data,
 static void handle_display_destroy(struct wl_listener *listener, void *data) {
 	struct wlr_pointer_gestures_v1 *gestures =
 		wl_container_of(listener, gestures, display_destroy);
+	wl_signal_emit_mutable(&gestures->events.destroy, NULL);
 	wl_list_remove(&gestures->display_destroy.link);
 	wl_global_destroy(gestures->global);
 	free(gestures);