Down the back of the WALTER Themer's Guide:
Quote:
folderstate:
folder state of track, if applicable (0 for normal, 1 for
folder, -n for last track in folder(s))
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So if I understand correctly, you would need different tests
?folderstate is true for a folder
!folderstate is true for an ordinary track
folderstate<0 is true for the last track in the folder
Another variable, folderdepth is positive if the track is in a folder (it represents how many folders deep is the track). So, for all child tracks folderdepth>0 is true