qf_update_win_titlevar(qf_info_T *qi)
{
    qf_list_T	*qfl = qf_get_curlist(qi);
    tabpage_T	*tp;
    win_T	*win;
    win_T	*save_curwin = curwin;

    FOR_ALL_TAB_WINDOWS(tp, win)
    {
	if (is_qf_win(win, qi))
	{
	    curwin = win;
	    qf_set_title_var(qfl);
	}
    }
    curwin = save_curwin;
}