if (i->second->last_monitor() != (x = i->second->monitoring_input ())) {
i->second->set_last_monitor (x);
/* XXX I think this is dangerous, due to
if (i->second->last_monitor() != (x = i->second->monitoring_input ())) {
i->second->set_last_monitor (x);
/* XXX I think this is dangerous, due to