While it's good in general that pressing Enter from a track's AC editor moves to the next one, right now the implementation is somewhat overkill in that pressing Enter on a search dropdown (which one would expect would just select the artist) also moves to the next track's AC editor. This makes it impossible to change the "credited as" field or check the "change all other ACs matching this" checkbox. In this case, Enter should simply select the artist and keep focus on the same artist field.