>>>>> "Kai" == Kai Grossjohann <grossjohann@charly.cs.uni-dortmund.de> writes:

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

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

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

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

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

I fixed all of these by redefining the interface between Gnus and the back
end to support dealing with crossposted articles.  Then I defined some new
user commands to take advantage of the new interface.

The problem is that I only implemented the new inferface for the nnml back
end.  My changes can't be integrated into Gnus until someone implements
the new interface for all back ends.  I posted a long and very detailed
message about these changes back in January.  I am including a copy of
this message below.

I would be really happy to send copies of my changes to anyone who wanted
to do the work necessary to integrate them into Gnus.  Lars has already
agreed with the changes in principle.  I sent the changes to him a long
time ago, but I don't think he has the necessary motivation to do the
additional work himself.

-- 
Joe Wells <jbw@dcs.gla.ac.uk>