[Dovecot] A previously unreported lsub/list discrepancy in 1.1rc5 and earlier

[Adam McDougall]

Not sure about 1.0, I don't run it anymore :) But a few users discovered 
for a small issue that only affects a very small portion of my userbase 
where instructional correction will suffice.  I guess I am reporting it 
in the interest of getting it out there, and I can live with it if not 
fixed but it might be an issue for some people.  I'm running through my 
list of issues.  Basically, if a user has a valid namespace prefix set 
such as mail/ (used to be required on old mail server but discouraged on 
new mail client setups with dovecot), lsub/list do not show public 
namespaces that the user has permission to via acl.  If the user removes 
the namespace prefix, they can 'see' the public folders and subscribe.  
Additionally if the user subscribes to a public folder then puts mail/ 
back in the prefix, the folders are no longer listed.   Not sure if 
public folders should be affected by the requested prefix in this 
manner, since they are not in the user's account.

With prefix set:
3 lsub "" "mail/*"
4 list "" "mail/%"
5 list "" "mail/%/%"

* OK [RAWLOG TIMESTAMP] 2008-05-05 21:07:16
* LSUB () "/" "mail/INBOX"
* LSUB () "/" "mail/Sent Items"
* LSUB () "/" "mail/Drafts"
* LSUB () "/" "mail/Junk E-mail"
* LSUB () "/" "mail/Sent"
* LSUB () "/" "mail/Trash"
3 OK Lsub completed.
* LIST (\HasNoChildren) "/" "mail/Drafts"
* LIST (\HasNoChildren) "/" "mail/Sent Items"
* LIST (\HasNoChildren) "/" "mail/Junk E-mail"
* LIST (\HasNoChildren) "/" "mail/Sent"
* LIST (\HasNoChildren) "/" "mail/Trash"
4 OK List completed.
5 OK List completed.

Without prefix set:
3 lsub "" "*"
4 list "" "%"
5 list "" "%/%"

* OK [RAWLOG TIMESTAMP] 2008-05-05 21:07:49
* LSUB () "/" "INBOX"
* LSUB () "/" "Sent Items"
* LSUB () "/" "Drafts"
* LSUB () "/" "Junk E-mail"
* LSUB () "/" "Sent"
* LSUB () "/" "Trash"
3 OK Lsub completed.
* LIST (\HasNoChildren) "/" "Drafts"
* LIST (\HasNoChildren) "/" "Sent Items"
* LIST (\HasNoChildren) "/" "Junk E-mail"
* LIST (\HasNoChildren) "/" "Sent"
* LIST (\HasNoChildren) "/" "Trash"
* LIST (\HasNoChildren) "/" "INBOX"
4 OK List completed.
* LIST (\Noselect \HasChildren) "/" "#shared/be"
* LIST (\Noselect \HasChildren) "/" "#shared/me"
* LIST (\Noselect \HasChildren) "/" "#shared/cee"
5 OK List completed.