From http://bugs.musicbrainz.org/ticket/3550

Right now, a green tick indicates both the tags and filenames are 100% OK.

It would be nice to have a separate indicator for both the tags and filenames.

This is helpful when you need to know if your files will be renamed after a save, e.g. when the files are listed in playlists, or, in my case, when they're in a repository.

And, of course, it is nice to know what will happen with your files in a blink of an eye.