Problems with subscriptions & Thunderbird on 2.5.7

[Robert Mueller]

FYI a user of ours encountered this recently and we came to the
conclusion it's a Thunderbird bug. An edited conversion I had with Bron
is below.

Checking the Thunderbird bugzilla, I see multiple reports of this. In
particular a bug that was supposedly fixed in 2010 seems to have
recently re-appeared for some people.

https://bugzilla.mozilla.org/show_bug.cgi?id=592633

See comments near the bottom of that bug. Someone has opened a new bug.

https://bugzilla.mozilla.org/show_bug.cgi?id=1089351

I see an old bug similarly related to this.

https://bugzilla.mozilla.org/show_bug.cgi?id=529618

There's this comment near the bottom:

---
Workaround was fortunatly found accidentally : Double click of IMAP
folder.
When IMAP folder was double clicked at folder pane, expand button
automatically appeared and subfolder was automatically shown when
subfolder exists.
---

Can you check if that works for you?

Rob

-----
me:
It appears LSUB and LIST (SUBSCRIBED) are only returning \HasChildren if
there's a subscribed child mailbox, not if the actual mailbox has
children. That seems wrong...

Example in a users mailbox.

. list INBOX.x.y.2015 *
* LIST (\HasChildren) "." INBOX.x.y.2015
... many more sub-folders ...

. lsub INBOX.x.y.2015 *
* LSUB () "." INBOX.x.y.2015
. OK Completed (0.010 secs 2 calls)

. list (subscribed) INBOX.x.y.2015 *
* LIST (\Subscribed) "." INBOX.x.y.2015
. OK Completed (0.010 secs 2 calls)

bron:
My reading of those is that they're correct.  HasChildren actually only
needs to be calculated in two cases:

1) it's been explicitly asked for with a RETURN option in LIST-EXTENDED

2) the expression matches a non-existent intermediate folder, but not
its existent children.

Otherwise it's nice to do, but not required.

In particular, both LSUB and RETURN SUBSCRIBED only iterate the
subscriptions database - so they don't know about children.  We don't
calculate them unless explicitly requested.

I really do think it's a Thunderbird bug.

me:
. list INBOX.x.y.2015 * return (children)
* LIST (\HasChildren) "." INBOX.x.y.2015

. list (subscribed) INBOX.x.y.2015 * return (children)
* LIST (\Subscribed \HasChildren) "." INBOX.x.y.2015

Yeah, I think you might be right, the lack of both \HasChildren or
\HasNoChildren shouldn't imply anything.


On Wed, 13 Apr 2016, at 01:05, Giles Malet via Cyrus-devel wrote:
> Before I head off to read RFCs, and try to understand what Cyrus is doing
> and Thunderbird, and what is going wrong, I just wanted to ask if anyone
> already knows the answers. Specifically, using LIST-EXTENDED, should a
> mail client be able to determine which folders are subscribed to, and if
> so why is Cyrus apparently not returning that information? Conceivably TB
> is doing it wrong though. And if TB is trying to set a \Subscribed flag
> on a folder, should that be updating Cyrus's list of subscriptions?
> 
> Anyhow, I'll see if I can get some traces of what's going on, and see if
> that's what should be going on.
> 
> Thanks,
> g


-- 
Rob Mueller
robm at fastmail.fm