rootston: fix damage when changing views z-index

rootston/seat.c

@@ -764,6 +764,8 @@ void roots_seat_set_focus(struct roots_seat *seat, struct roots_view *view) {
 	wl_list_remove(&seat_view->link);
 	wl_list_insert(&seat->views, &seat_view->link);
 
+	view_damage_whole(view);
+
 	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->seat);
 	if (keyboard != NULL) {
 		wlr_seat_keyboard_notify_enter(seat->seat, view->wlr_surface,