[Evolution] Is Evo losing track of \Unseen?

[Patrick O'Callaghan <poc usb ve>]

I'm noticing some strange phenomena with 2.24.3:

1) Certain mail filters are *occasionally* copying the same message
multiple times to a destination folder. This doesn't look like an MTA
delivery failure because the various copies are bit-for-bit identical,
including header info. I keep a log of filter activity. I check my mail
every 10 minutes and I see the rule firing for a specific message, then
10 minutes later nothing, then maybe 20 minutes later it will fire again
(I stress this is on the *same* message) etc. etc. This happens with
several different -- though similar -- filter rules on different mailing
lists. For a time I thought it could possibly be a server problem, but
then I got the second problem ...

2) On a different server (Gmail accessed via IMAP) some messages are
persistently marked as new even after being read and marked as seen. The
visible state is updated in Evo, I visit a different folder, come back
again and voila, the message is new again. I repeat: it's the *same*
message, not a copy.

I speculate that Evo is caching the message state and that the cache
code is buggy, but I'm not a devel so any insights are welcome before I
report this to BZ.

poc