Wolfram Fenske <Wolfram.Fenske@Student.Uni-Magdeburg.DE> writes:

> Hello!
>
> I have sent mail Gcc-ed to a folder on my IMAP-server.  This mostly
> works, but the copy in the sent-mail folder is never marked as read.
> In my .gnus.el I have:
>
> --8<---------------cut here---------------start------------->8---
> (setq gnus-message-archive-group  "nnimap+uni:INBOX.sent-mail"
>       gnus-gcc-mark-as-read       t)
> --8<---------------cut here---------------end--------------->8---
>
> If I use nnfolder [...], archiving works as it should.

I've tracked it down.  The error occurs here:

--8<---------------cut here---------------start------------->8---
(defun gnus-group-make-articles-read (group articles)
  "Update the info of GROUP to say that ARTICLES are read."
  (let* ((num 0)
	 (entry (gnus-gethash group gnus-newsrc-hashtb))
    ... ; some more initializing
    (when entry
      ... ; do all the work
--8<---------------cut here---------------end--------------->8---

For my IMAP sent-mail group, "entry" is always "nil" because "group"
is "nnimap+uni:INBOX.sent-mail" but my ~/.newsrc.eld contains only
entries like "INBOX.sent-mail", i. e. the prefix "nnimap+uni:" is
missing.

Now the question is: why don't I have the prefixes in ~/.newsrc.eld?
Is this because nnimap is my primary gnus-select-method?  A while back
I had nnimap as my secondary select method and I think I didn't have
this problem then.

Also: is there a bug in "gnus-group-make-articles-read" or is it my
config?  I tought

--8<---------------cut here---------------start------------->8---
(setq gnus-message-archive-method '(nnimap "my.imap.server.de")
      gnus-message-archive-group  "INBOX.sent-mail")
--8<---------------cut here---------------end--------------->8---

might do the trick, but this didn't fix it, either.

If there really is a bug, and someone can tell me what's going on with
those prefixes, I'd be happy to write a patch.  Until then, I'm using
this workaround: