- Real thickness = me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
- SCM lt = me->get_grob_property ("thickness");
- if (gh_number_p (lt))
- thickness *= gh_scm2double (lt);
+
+ Real thickness = Staff_symbol_referencer::line_thickness (me);
+ thickness *= robust_scm2double (me->get_property ("thickness"), 1.0);