Re: Synchronize Gnus and IMAP's notion of read mail

[Eli Zaretskii <eliz@gnu.org>]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Fri, 21 Jun 2024 17:21:38 -0400
> 
> Apparently there's a bug in Gnus which causes it to sometimes fail to
> tell IMAP that some messages are "read" (or maybe it causes some messages
> to be re-set to "unread"?  I don't know).
> 
> In any case, what I do know is that what my IMAP server considers as
> "read" is not the same as what Gnus thinks, even though I basically
> never access my IMAP server via anything else than Gnus.
> 
> I have not yet figured out how/why this happens, but instead I'm
> wondering how I can fix the consequence of the bug by re-synchronize
> Gnus with IMAP.
> 
> I know how to get Gnus to forget its own notion of "read" and (re)fetch
> all that info from IMAP.  But I'd like to do the reverse: have Gnus tell
> IMAP which messages should be considered "read" and which not (of
> course, being careful not to affect those messages which Gnus hasn't
> seen yet).
> E.g. something like have Gnus go through all the messages that IMAP say
> are "unread" and mark them (in IMAP) as "read" if Gnus thinks they've
> already been "read".
> 
> How can I do that?

Eric, can you help Stefan?