How to ignore some composers

[ac16161]

Can I confirm my understanding of how the tag updating works: essentially, all actions associated with a tag @xxx= statement must be blocked together?

E.g. if at one point in the file we have

@GENRE=Pop Rock
=GENRE=Pop/Rock

but then later in the file we have

@GENRE=Pop Rock
+MAINGENRE=Main

then only the second update gets made. For both updates to apply, we need

@GENRE=Pop Rock
=GENRE=Pop/Rock
+MAINGENRE=Main

I ask this since the behaviour based on a tag update file that firstly processes all the synonyms and then processes the addition of main library tags did not quite work - I had to merge these steps together, which made the R code slightly more fiddly but the end result is now pretty solid.