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From: Hrvoje Niksic <hniksic@srce.hr>
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Subject: Re: Expiry in virtual groups
Date: 17 Apr 1999 18:22:00 +0200
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Lars Magne Ingebrigtsen <larsi@gnus.org> writes:

> It is not the case.  Expiry is done from
> `gnus-summary-prepare-exit-hook' (which defaults to
> `gnus-summary-expire-articles').  The obvious kludge would be to
> have the latter function also expire component groups if the current
> group is a virtual group.

I don't think that would be a kludge, it's exactly the right solution.
If you feel it breaks the Gnus-vs-backends abstraction, you could make 
a way for backends to specify some sort of expiry parameters.

> But `gnus-summary-expire-articles' takes into account group props
> and stuff, and we don't want the group props from the virtual group
> to adhere to the component groups, do we?

We don't.  But then again, maybe it really /should/ be an
nnvirtual-specific kludge.

> Can't you just `C-c M-C-x' once in a while, like I do?  :-)

I can, but it's sort of yucky to have to do that.  I've never needed
to do it so far.