- return !((head_count (me)
- || stemlet_length > 0.0)
- && scm_to_int (me->get_property ("duration-log")) >= 1);
+ Grob *me = unsmob_grob (smob);
+ Interval iv;
+
+ if (!is_normal_stem (me))
+ return ly_interval2scm (iv);
+
+ Real ss = Staff_symbol_referencer::staff_space (me);
+ Real len = scm_to_double (calc_length (smob)) * ss / 2;
+ Direction dir = get_grob_direction (me);
+
+ Interval hp = head_positions (me);
+ if (dir == UP)
+ iv = Interval (0, len);
+ else
+ iv = Interval (-len, 0);
+
+ if (!hp.is_empty ())
+ iv.translate (hp[dir] * ss / 2);
+
+ return ly_interval2scm (iv);