[Dovecot] Better APPEND performance

[Timo Sirainen]

On Wed, 2009-10-07 at 17:53 -0500, Mike Abbott wrote:
> What can be done to make maildir_uidlist_refresh_fast_init() choose  
> the fast path more often?

Pretty simple bug. Fixed:
http://hg.dovecot.org/dovecot-1.2/rev/ebdba086e3b1

This makes the performance pretty good when appending to maildirs with
large number of messages. In my desktop the append speed stays pretty
constant at ~500 msgs/sec after 20k messages, while without the patch it
crawls at ~30-40 msgs/sec.

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