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From: Dan Christensen <jdc@uwo.ca>
Subject: Re: bug#72949: Gnus sometimes reports new messages but not showing them on IMAP server
Date: Sat, 14 Sep 2024 12:28:37 -0400
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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