+Rhythmic_column_engraver::add_spacing_item (Grob *g)
+{
+ if (spacing_)
+ {
+ Pointer_group_interface::add_grob (spacing_,
+ ly_symbol2scm ("left-items"),
+ g);
+
+ if (last_spacing_)
+ {
+ Pointer_group_interface::add_grob (last_spacing_,
+ ly_symbol2scm ("right-items"),
+ g);
+ }
+ }
+}
+void
+Rhythmic_column_engraver::process_acknowledged ()