SCM vis = bars_[0]->internal_get_property (vissym);
if (ly_c_equal_p (spanbar_->internal_get_property (vissym), vis))
spanbar_->internal_set_property (vissym, vis);
SCM vis = bars_[0]->internal_get_property (vissym);
if (ly_c_equal_p (spanbar_->internal_get_property (vissym), vis))
spanbar_->internal_set_property (vissym, vis);