- top().pos() = min(tm.x2pos(pit(), next_row, xo), top().lastpos());
-
- int const xpos = tm.x2pos(pit(), next_row, xo);
- bool const at_end_row = xpos == tm.x2pos(pit(), next_row, tm.width());
- bool const at_beg_row = xpos == tm.x2pos(pit(), next_row, 0);