[Dovecot] [PATCH proposal] make dsync preserve pop3_uidl_format

Hi there,

I ran into an issue yesterday (dovecot 2.0) whereby when we dsync messages from a local machine (sdbox) to a remote (Maildir) which have different pop3_uidl_formats configured, the uidl format is not preserved. There doesn't seem to be any way to force this in the code, although I suspect that Maildir sources with saved pop3 uidls would pass them correctly. Attached is a rough patch against 2.0.21 dsync which will generate the uidls on the client before passing them over to the destination. This only works for %u and %v currently, also because dsync doesn't read the whole config file you need to specify -o pop3_uidl_format=... to dsync.

Mark