+void
+Trill_spanner_engraver::acknowledge_note_column (Grob_info info)
+{
+ if (span_)
+ {
+ Pointer_group_interface::add_grob (span_,
+ ly_symbol2scm ("note-columns"),
+ info.grob());
+ if (!span_->get_bound (LEFT))
+ add_bound_item (span_, info.grob ());
+ }
+ else if (finished_)
+ {
+ Pointer_group_interface::add_grob (finished_, ly_symbol2scm ("note-columns"),
+ info.grob());
+ if (!finished_->get_bound (RIGHT))
+ add_bound_item (finished_, info.grob ());
+ }
+}
+