+ 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 *, bool *);
+ static void standard_breakable_column_spacing (Grob *me, Item *l, Item *r,
+ Real *fixed, Real *space,
+ Spacing_options const *);
+