staff_space_ = Staff_symbol_referencer::staff_space (me);
Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
thickness_ = robust_scm2double (me->get_property ("thickness"), 1.0) * lt;
staff_space_ = Staff_symbol_referencer::staff_space (me);
Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
thickness_ = robust_scm2double (me->get_property ("thickness"), 1.0) * lt;