+ int break_index_;
+ // todo: move to somewhere else.
+ Real get_broken_left_end_align () const;
+ void substitute_one_mutable_property (SCM sym, SCM val) ;
+ bool fast_fubstitute_grob_list (SCM sym, SCM grob_list);
+ // TODO: make virtual and do this for Items as well.
+ Interval_t<int> spanned_rank_iv ();
+ void set_bound (Direction d, Grob*);
+ Item *get_bound (Direction d) const;