dovecot - Jan 2013 - map_uid/GUID at IMAP level (IMAP extension?)

Is map_uid/guid going to be supported at IMAP protocol level? [via IMAP
protocol extension]

Specifically I would like to be able to:
a) ask for mail_uid/GUID of specific message in mail store
b) get list of folders containing copies of message with given mail_uid/GUID

http://wiki2.dovecot.org/MailboxFormat/dbox#Multi-dbox

Related:
https://developers.google.com/google-apps/gmail/imap_extensions#access_to_the_gmail_unique_message_id_x-gm-msgid
[message to guid mapping]

https://developers.google.com/google-apps/gmail/imap_extensions#access_to_gmail_labels_x-gm-labels
[message to list of folders mapping]

On 2.1.2013, at 17.14, Andrzej A. Filip <andrzej.filip at gmail.com>
wrote:
> Is map_uid/guid going to be supported at IMAP protocol level? [via IMAP
> protocol extension]
map_uid is completely mdbox-specific. I don't see any point in offering it.
> Specifically I would like to be able to:
> a) ask for mail_uid/GUID of specific message in mail store
a FETCH 1:* X-GUID
> b) get list of folders containing copies of message with given
mail_uid/GUID
Create a virtual mailbox out of all your folders, then:

a SELECT virtual/allmails
b SEARCH X-GUID abcdefg

With current code that keeps all of the folders' index files open, so not
very good if you have lots of folders. Even if that's fixed it would still
require opening and reading all the folders' index files, even if it's
one at a time.

Currently Dovecot doesn't really need a quick way to access a mail by its
GUID, although dsync could benefit from it.