Re: Gnus sometimes fails to see a message that is actually in IMAP

[Eric Abrahamsen <eric@ericabrahamsen.net>]

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>
>> Greg Troxel <gdt@lexort.com> writes:
>>
>> Wow, this is a ton of information! Thanks for all the background. Kudos
>> on using TLS on your own machine, something I have never had the
>> patience to set up.
>>
>>> I have changed the subject, as I am not at all sure that my problem is
>>> the same as "reports new messages but not showing them on IMAP server".
>>> In my case, it seems to me as if there is a filter between gnus and the
>>> IMAP server that redacts a message.
>
> Brief update -- when I started looking further into this, I realized
> that I have the same issue with the INBOX of one of my main IMAP
> accounts. I'd just not noticed because I have 486 unread messages in
> that folder :( Well, 483 according to Gnus.
>
> This account includes a remote Dovecot on the server that actually
> receives mail, and two local machines that each have their own local
> Dovecot, and Emacs/Gnus. The remote and local Dovecots are synced with
> mbsync, and both remote and local report 486 unread messages when
> checked with doveadm.
>
> My other local machine is currently not booting, but I'll be very
> curious to see if Gnus on that machine is wrong in the same way
> (a deterministic bug) or not (space gremlins).
>
> Otherwise, the difference between "g" and "M-g", for IMAP servers that
> support qresync, is that "g" goes the qresync route:
>
> EXAMINE <group> (QRESYNC (<uidvalidity> <modseq>))
>
> while "M-g" does a full fetch of flags:
>
> "UID FETCH 1:* FLAGS"
>
> So that's a pretty strong indicator that there's a bug in the qresync
> branch of `nnimap-update-qresync-info'. Some have reported bugs that
> *weren't* resolved by "M-g", so there will likely be a few things to
> fix, but one thing at a time.

I'm currently looking with deep suspicion at the very beginning of that
function:

  ;; Add all the vanished articles to the list of read articles.
  (setf (gnus-info-read info)
        (range-add-list
         (range-add-list
          (range-concat (gnus-info-read info) vanished)
	  (cdr (assq '%Flagged flags)))
	 (cdr (assq '%Seen flags))))