Subscribing to nnimap folders that are subscribed on IMAP servers

[Ryan Kavanagh]

Hi,

I am trying to use gnus as an IMAP mail client. I have folders marked as
subscribed on my IMAP server (listed by LSUB). I would like to have gnus
automatically subscribe to these folders, or at least list them so that
I can manually subscribe gnus to them myself. How can I do so? I am
using gnus 5.13 under Emacs 27.1.

Grepping around in /usr/share/emacs/27.1/lisp/gnus, the only mention I
have found of LSUB is in the documentation for the function
gnus-group-nnimap-edit-acl, but that seems to be for editing the ACL for
an IMAP folder [0].

Digging around in the history of nnimap.el, it looks like there used to
be the following variable that would have done what I wanted, but it was
removed in 2010 [1]:

(defvar nnimap-request-list-method 'imap-mailbox-list
  "Method to use to request a list of all folders from the server.
  If this is 'imap-mailbox-lsub, then use a server-side subscription list to
  restrict visible folders.")

Is there some other variable/function I'm missing that I could use to
get this done?

Best wishes,
Ryan

[0] https://datatracker.ietf.org/doc/html/rfc4314
[1] 
https://git.savannah.gnu.org/cgit/emacs.git/commit/lisp/gnus/nnimap.el?id=20a673b2d0ed2b2f75ab5d7d6e4930fdea0e1a5f

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