# IMAPTracker is also used for tracking NNTP, UID == article number
# LIST.ACTIVE can get the equivalent of UIDVALIDITY, but that's
# expensive. So we assume newsgroups don't change:
# IMAPTracker is also used for tracking NNTP, UID == article number
# LIST.ACTIVE can get the equivalent of UIDVALIDITY, but that's
# expensive. So we assume newsgroups don't change: