Full-on track additions and removals are excluded, because those aren't *changed* recordings, and it's obvious from the tracklist itself. This isn't different than the previous setup, but I've expressed it differently to reflect the fact $tracklist_changes calculates the diff somewhat differently and for the purposes of *this* block it may come up 'unchanged' even though there's relevant changes (or, at least, this is my understanding -- I'm only excluding things that need to be, rather than filtering only for things that "appear correct").