[Dovecot] LSUB and namespaces - how to get rid of multible prefixes

[Henrik Ostergaard Madsen]

I'm using dovecot 1.0.rc7 and Squirrelmain 1.4.8 using IMAP on a Debian 
3.1 Testing system, and I'm having a problem.

When Squirrelmail (or other IMAP clients) submits an LSUB "" "*%", 
dovecot responds with:

Request:
A004 LSUB "" "*%" 
Response:
* LSUB () "/" "INBOX.Sent" 
* LSUB () "/" "INBOX.Trash" 
* LSUB () "/" "INBOX.Drafts" 
* LSUB () "/" "mail/Sent" 
* LSUB () "/" "mail/Trash" 
* LSUB () "/" "mail/Drafts" 
* LSUB () "/" ".mail/Sent" 
* LSUB () "/" ".mail/Trash" 
* LSUB () "/" ".mail/Drafts" 
* LSUB () "/" "Sent" 
* LSUB () "/" "Trash" 
* LSUB () "/" "Drafts" 
* LSUB () "/" "INBOXSent" 
* LSUB () "/" "INBOXTrash" 
* LSUB () "/" "INBOXDrafts" 
* LSUB () "/" "./INBOX.Sent" 
* LSUB () "/" "./INBOX.Trash" 
* LSUB () "/" "./INBOX.Drafts" 
* LSUB () "/" "Test" 
Lsub completed.

This is in spite of that only INBOX.Sent, INBOX.Trash, INBOX.Drafts and 
Test actually exists.

I have tried with no explicit namespaces, only one with no prefix or with 
prefix "/", and with that again and all the above prefixes marked as hidden, 
but with absolutely no change in the LSUB repons.

Due to this, Squirrelmail shows up a whole bunch of folders, but only the 
correct ones (without prefixes) works..

This has been the same with a few prior versions of dovecot 1.0 , but not 
with dovecot 0.99. It is the same for Squirrelmail 1.4.7, but I do not think 
the client matters..

Is there a setting or way to deal with this - or is it a bug?

Regards,

Henrik