I need to ensure that if this action group is REapplied to a track, it applies its transform of TITLE, ARTIST, ALBUM, GENRE only once.
Currently my best solution is as you see there. For each field, if a copy is not already saved, I save a copy. Then I do the transform on the saved copy.
This is to avoid need for a condition on every step of the transform.
Can anyone see a better method?