+ // GraceChange is announced in order to make the Grace_engraver able
+ // to distinguish \stemNeutral \grace { ... and \grace { \stemNeutral ...
+ if (in_grace_ != bool (m.grace_part_) && child_iter_ && child_iter_->get_outlet ())
+ {
+ send_stream_event (child_iter_->get_outlet (), "GraceChange", get_music ()->origin ());
+ }
+ in_grace_ = m.grace_part_;