[Dovecot] 1.0-test16 - nearing usable state

[Timo Sirainen]

http://dovecot.org/test/

Here you go, maildir syncing problems finally fixed (I hope). Well,
except there's this "new-dir-only syncing" optimization which I'm not
really sure if it works as it should.

The bug really was in index code as I was beginning to suspect. The good
thing is that while trying to figure it out over the last several weeks
I thought of many other potential problems (race conditions) which got
fixed. Those would have been much harder to find than this one :)

Finally I thought I'd stop looking at the code and just begin dumping
tons of debugging data to see where exactly it goes wrong. After few
hours of debugging I figured out it was because message was being
removed from index but not from maildir. 5 hours of sleep later I woke
up, thought a while, figured out where it must be, got up, half an hour
more debugging and found it. :) Code merging two UID range buffers into
one was buggy, inserting one line of code fixed it.

So .. Maybe I'll finally start using this myself now. The next important
problems seem to be some random error messages about index locking
timeouts and some asserts in some situations.

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