sc_vtb_rows
cur_lines = sc_vtb_rows(history);
lines = sc_vtb_rows(from);
cur_lines = sc_vtb_rows(history);
sc_vtb_rows(scp->history), extra_history_size));
new_ysize = sc_vtb_rows(scp->history);
new_ysize = sc_vtb_rows(scp->history);
new_ysize = sc_vtb_rows(scp->history);