[Bug 603402]

[M-wada-7]

(In reply to alister.hood from comment #52)
> But testing a few more times I discovered that it actually does work, just only every second time
> - i.e. I have to do "offline>online>other folder>back to folder>offline>online>other folder>back to folder" before it updates.

It's perhaps "connection loss during IDLE".
  IDLE -> Sm/Tb(and server) enters "receive state" -> Work Offline -> Tb closes server connection(Socket, TCP/IP level)
  Tb perhaps closes IMAP connection. But for SeaMonkey, this is perhaps  "connection loss during IDLE".
  By click of Inbox again, Sm tries to send DONE(enters Send mode)
  -> because TCP session is already closed by Sm, nothing is sent to server, and Sm waits for timeout.
  -> go Work Offline/Online again -> send of DONE fails and imap connection is normally closed in Sm
  -> by next click of Inbox, TCP session is established and imap connection is established
It seems that error detection code is different between SeaMonkey and Thunderbird.

> so I guess Seamonkey doesn't implement it per account - or should I
just create the setting?

There is no need of guessing. "CONDSTORE is aactually used or not" is
always clearly known pretty easily by simply looking imap log.

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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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