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From: Toby Speight <streapadair@gmx.net>
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Subject: gnus-undo-mode and nnimap
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Try this:

1. Enter a nnimap group with unread articles.

2. Read the articles and leave the group.  The *Group* buffer will
   show the group as having 0 unread articles.

3. M-x gnus-undo  (or C-_, by default).  The *Group* buffer will now
   show the group as having >0 unread articles.

4. Enter the group.  The articles you thought you had, er, unread (by
   undoing the read) are marked with the read mark.

I know this is the same effect as the generally useful feature of
accepting the server's marks over Gnus's, but WIBNI gnus-undo actually
told the backend to change its stored marks?  (Or if that's already
the case, WIBNI nnimap DTRT when it's told?)