bool no_vertical_start = orig_span && !broken_first_bracket;
bool no_vertical_end = orig_span && !broken_last_bracket;
extract_grob_set (me, "bars", bars);
bool no_vertical_start = orig_span && !broken_first_bracket;
bool no_vertical_end = orig_span && !broken_last_bracket;
extract_grob_set (me, "bars", bars);