bug#33402: 27.0.50; Test Gnus group names when reading from the browse mode

[Eric Abrahamsen]

When browsing server groups through the *Gnus Browse Mode* interface,
entering a group either reads the solid group, if it's already active,
or creates an ephemeral copy of the server and reads it there, if it
isn't.

That might work for nntp servers, but for servers like nnmaildir that
keep their own group accounting, if you create an ephemeral copy of the
server it will have no groups, and you can't browse the group from the
Browse interface.

This patch checks if the group in question belongs to the native server,
and shortens the group name if so, so that we can accurately know if the
group is subscribed or not.

Eric

0001-Check-Gnus-group-names-when-reading-from-a-browse-se.patch
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