+MAKE_SCHEME_CALLBACK (Accidental_interface, width, 1);
+SCM
+Accidental_interface::width (SCM smob)
+{
+ return get_extent (unsmob_grob (smob), X_AXIS);
+}
+
+MAKE_SCHEME_CALLBACK (Accidental_interface, pure_height, 3);
+SCM
+Accidental_interface::pure_height (SCM smob, SCM start_scm, SCM)
+{
+ Item *me = dynamic_cast<Item*> (unsmob_grob (smob));
+ int start = scm_to_int (start_scm);
+ int rank = me->get_column ()->get_rank ();
+
+ if (to_boolean (me->get_property ("forced"))
+ || !unsmob_grob (me->get_object ("tie"))
+ || rank == start + 1) /* we are at the start of a line */