[Bug 603402]

[Raman Gupta]

I've found that some extensions also cause problems with this. Two that
I've found so far are:

- ImportExportTools (seems to do lots of concurrent IMAP operations with Tbird, often resulting in "Operation in progress" messages)
- Send Without Save(Copy Sent to Current has equivalent functionality and seems to be fine)

Once I disabled the above extensions, using a cyrus imapd 2.4 IMAP
account that supports IDLE and CONDSTORE, Tbird changes from often
requiring the Offline/Online trick, to usually updating immediately,
sometimes requiring a folder change to see the updates, and occasionally
requiring a Compact to see the updates. But as far as I have seen so
far, Tbird now never requires Offline/Online to sync the folder, which
is a huge improvement.

Disabling CONDSTORE further improves matters and Tbird more often
(always?) updates the folder immediately. Obviously that is related to
the separate CONDSTORE issues though.

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https://bugs.launchpad.net/bugs/603402

Title:
  Thunderbird incorrectly shows some Gmail archived messages as unread
  via IMAP

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