return;
grouping_->add_stem (now - beam_start_moment_ + beam_start_location_,
- durlog - 2);
+ durlog - 2,
+ Stem::is_invisible (stem));
stems_->push_back (stem);
last_add_mom_ = now;
extend_mom_ = max (extend_mom_, now) + get_event_length (ev, now);