[Dovecot] IMAP subscribe/unsubscribe broken in 0.99.10.2

IMAP subscribe/unsubscribe is broken in 0.99.10.2 (and earlier releases), specifically subsfile_set_subscribed(), where the logic is all wrong. I tried just copying over the latest subscription-file.c but it has dependencies on some file locking/dotlocking stuff that 0.99.10.2 doesn't have.

Timo, would it be possible to incorporate the latest subscription-file.c into 0.99.10.3 (whenever that will be)?

Matt