Use Drumset not fully reverting when turned off

If you set the Use Drumset option, and then unset the option, the score remains with the same note markings as if a drumset were still being used. At a minimum it would be nice to get a warning before setting the Use Drumset option that you will not be able to get back to the original apearrance state of the score (undo does not work either.)

This bug could cause loss of work -- if you have done a bunch of work to the score then select/unselect Use Drumset for some reason, you may have to revert to your last saved score to regain original note appearance, losing your other work.