dovecot - Oct 2010 - lazy_expunge and moving messages

Hello,

testing the lazy_expunge plugin (with 2.0.5), I realized the
following effect, which users may not expect/understand:

As moving messages from one folder to another has to be done by
clients with the IMAP command sequence COPY STORE EXPUNGE, every moved
message is also put into the "shadow folder" of the source folder.

Maybe it's possible to extend the plugin to optionally hook into the COPY
operation, remember it somewhere with the message (simply as special/
configurable IMAP flag?), and then really expunge messages with this
flag set. What do you think? I haven't looked into the plugin interface yet.
Of course, if a user manually copies a message and deletes the source
message later (maybe having the copy deleted inbetween...), the consequence
may not be expected either...

Greetings,
   Lutz

-- 
Lutz Pre?ler  <Lutz.Pressler at SerNet.DE>    http://www.SerNet.DE/
SerNet Service Network GmbH, Bahnhofsallee 1b, D-37081 G?ttingen
Tel.: +49-551-370000-2,      FAX: +49-551-370000-9
AG G?ttingen, HRB 2816,      GF: Dr. Johannes Loxen

On Fri, 2010-10-08 at 13:29 +0200, Lutz Pre?ler wrote:
> As moving messages from one folder to another has to be done by
> clients with the IMAP command sequence COPY STORE EXPUNGE, every moved
> message is also put into the "shadow folder" of the source
folder.
Yeah..
> Maybe it's possible to extend the plugin to optionally hook into the
COPY
> operation, remember it somewhere with the message (simply as special/
> configurable IMAP flag?), and then really expunge messages with this
> flag set. What do you think?
Tricky. Deleting messages is done by many clients by moving to Trash. In
such situation it's better to have the original messages in the original
mailbox, otherwise everything would end up in Trash. And of course, it's
not always called "Trash" but could be any one of the hundreds of
names
in different languages..