+ /* vertical ordering */
+ static Grob *get_root_vertical_alignment (Grob *g);
+ static Grob *get_vertical_axis_group (Grob *g);
+ static bool vertical_less (Grob *g1, Grob *g2);
+ static bool pure_vertical_less (Grob *g1, Grob *g2);
+ static bool internal_vertical_less (Grob *g1, Grob *g2, bool pure);
+ static int get_vertical_axis_group_index (Grob *g);
+