Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
Real th = robust_scm2double (me->get_property ("thickness"), 1) * lt;
Real font_size_step = robust_scm2double (me->get_property ("font-size"), 0.0);
Real h = robust_scm2double (me->get_property ("height"), 0.5)
Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
Real th = robust_scm2double (me->get_property ("thickness"), 1) * lt;
Real font_size_step = robust_scm2double (me->get_property ("font-size"), 0.0);
Real h = robust_scm2double (me->get_property ("height"), 0.5)