Deleting messages that are in several groups

[Kai Grossjohann <grossjohann@charly.cs.uni-dortmund.de>]

I asked this question on gnu.emacs.help but nobody answered.  Maybe
one of you gurus can help?

I put messages into at most one group, so I don't have a problem and
no experience with messages in more than one group.  But I've got a
colleague who wants to have each message in a lot of groups.  And thus
the following question.

In the following, `delete' means anything that causes the message to
be removed from a group, including the expiry process and `B DEL'.
But just being marked as read is not sufficient for a message to be
considered deleted (unless total-expire).

Is it possible to configure and/or use Gnus so that one has two
options for deleting a message that is in several groups:

  (a) remove it from the current group but leave it in all other
      groups
  (b) remove it from all groups it is in.

Some messages might be in several groups because of the splitting
process and nnmail-crosspost being t.  Some other messages might be in
several groups because they're explicitly put there with B c (or
should B C be used instead?).

Also, what happens when a message is `B m'ed from one group to
another?  Are all its old copies deleted or just the copy in the
current group?

I think the user in question would be happy with total-expire or
auto-expire or neither, your choice.  Just make it so that he has both
choices for `deleting'.

kai
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