for (it = g_list_last(stacking_list); it; it = g_list_previous(it)) {
if (WINDOW_IS_CLIENT(it->data))
windows[i++] = WINDOW_AS_CLIENT(it->data)->window;
for (it = g_list_last(stacking_list); it; it = g_list_previous(it)) {
if (WINDOW_IS_CLIENT(it->data))
windows[i++] = WINDOW_AS_CLIENT(it->data)->window;