Hi,

gnus-group has functions to list groups with dormant or cached articles,
but not ticked. That might be useful for some setups (for instance, I
have gnus-list-groups-with-ticked-articles set to nil and periodically
check my ticked messages with this), or just to look at groups with
ticked articles, and not unread ones. The following patch does just
that, and provides a binding for it. It's a trivial copy/paste from
gnus-group-list-dormant and -cached. There didn't seem to be much point
in abstracting the code out of these functions, since there are simple
wrappers around gnus-group-prepare-function.

Speaking of which, the interface in gnus-group-prepare-function is
slightly different than the one in gnus-group-prepare-flat, and code
calls gnus-group-prepare-function assuming the extended interface from
gnus-group-prepare-flat. Seems to me either gnus-group-prepare-function
should document the extended interface, or it should just be dispensed
with and gnus-group-prepare-flat called directly. Any reason to leave
the indirection?

Antoine