[sup-devel] Strange maildir/OfflineImap/maildir-sync behavior

["Edward Z. Yang" <ezyang@MIT.EDU>]

One day, I opened up an old thread to reread an email, and much
to my dismay, it was GONE!  Instead, there was one of those little
red flags that Sup sticks on mail that is referenced by other
threads, but which you don't have a copy of.

This was a bit bothersome, because no one likes it when their mail mysteriously
disappears. (It harkens back to a time when I accidentally deleted my entire
inbox, tried to undo, but Sup crashed in the process and then offlineimap
decided to sync the changes back to my main account, so I had to restore from
backup and run with maxage... but that's a story for another time...)

Some sleuthing, however, revealed that the messages had not disappeared; they
were still in my Maildir.  And sure enough, when I made Sup repoll the entire
Maildir (by restarting it), the messages reappeared (along with another 50
messages that I /swear/ I archived).

So my question is, why did Sup lose track of the messages?  Did it pick them
up while they were in new and then OfflineIMAP moved them and they got lost?
Can I make Sup tell me where it thinks a message should be living on my filesystem
so I can track these things?  Is this actually OfflineIMAP's fault?

Cheers,
Edward

P.S. Hey Damien, I know you're not planning on working on getting maildir-sync
merged to master until later this January, but I was wondering if a version of
the branch rebased on master would be of any use to you.
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