[Dovecot] 1.0rc25: double INBOX folder (weird)

[Jeff Mitchell]

I found a weird Thunderbird bug that sounds similar to this, so I'll 
describe it.  It affected the Windows version of Thunderbird, not the 
Mac (didn't have a chance to test out the Linux version).

I had migrated from Courier to Dovecot.  Courier had things in the INBOX 
namespace, and I got rid of that via the courier2dovecot script.  I had 
people running Thunderbird on Windows adjust their namespace and close 
Thunderbird, then delete their IMAP cache.  Then they restarted.

What Thunderbird then did was instead of using the Trash folder that was 
not in the INBOX namespace, it instead re-created the Trash folder as a 
subfolder of INBOX (Drafts and Sent did not have this problem).  It also 
added a subscription to this folder.  Both the Trash folders now (the 
one as a subfolder of Inbox and the one that wasn't) had the "trash" 
icon in Thunderbird, but Trash went to the one that was the subfolder of 
Inbox..  Attempting to go into the Thunderbird settings and change which 
of the two it was using did not help.

To fix this I had to have people close Thunderbird and delete their IMAP 
cache again.  On the server side, I then had to rm -rf the INBOX.Trash 
folder in their account, and manually edit their subscriptions file to 
get rid of the extra INBOX.Trash entry.  When they fired up Thunderbird 
again, it would start using the correct Trash folder.

IIRC this was the behavior on Thunderbird 1.5.  On 1.0 I believe it did 
the same thing but didn't re-add the INBOX.Trash folder to subscriptions 
(again, IIRC...it was a bit ago and I've tried to forget this 
nightmare).  Just another day in the life, and why I use KMail.  It may 
crash more, but it ain't crazy.

--Jeff