Re: bug#72949: Gnus sometimes reports new messages but not showing them on IMAP server

An alternative to

  (max (1+ (- (cdr active) (car active))) 0)

would be (range-length active), I believe.  (Untested.)  That function
assume that the range is well-formed, so doesn't use max to avoid
negative numbers, but that's probably fine.  (range-length '(1 . 0))
does correctly return 0.

Dan