+ static bool fills_measure (Grob *, Item *, Item *);
+public:
+ static vector<Grob*> get_columns (Grob *me);
+ static Real note_spacing (Grob *, Grob *, Grob *, Spacing_options const *);
+ static Spring standard_breakable_column_spacing (Grob *me, Item *l, Item *r, Spacing_options const *);
+