//lyxerr << class_to_string(mc1) << "+" << class_to_string(mc2)
// << "=" << spc_code << " @" << mb.style << endl;
if (spc_code < 0) {
//lyxerr << class_to_string(mc1) << "+" << class_to_string(mc2)
// << "=" << spc_code << " @" << mb.style << endl;
if (spc_code < 0) {