[Dovecot] Dovecot returns everything starting with "." as folder

[Christoph Hohmann]

Hi,

I'm using dovecot imapd 0.99.10.5 from debian unstable and I
noticed that dovecot returns everything in the maildir
folder that starts with a "." as a folder as the result of

  LIST "" "%"

command without checking if it is really a maildir folder
(must contain the directories cur, new, tmp and the file
maildirfolder).

This is a little bit annoying because it also returns
Sylpheed's cache files '.sylpheed_cache' and
'.sylpheed_mark' if they exist in the maildir.

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