nnimap unread count broken again

[Frank Schmitt <ich@frank-schmitt.net>]

Hello,

After Lars's rewrite of nnimap the problem that reading IMAP messages from
several Gnus instances caused wrong unread counts was fixed. However,
now it is there again and even worse then with the pre-Lars-nnimap.

If I get a new message, read it in Gnus A, then hit g in Gnus B, the
message is still unread. Even if I enter the group, the message is shown
as unread (at this point the old nnimap got it right at least). The
only way to get correct unread state and ticks is saying M-g on all nnimap
groups.

I think this problem was mentioned in previous messages already, so
before I start git bisecting or something: Is it already worked on?
The server in question is a dovecot BTW.

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