Inactive groups got unshown by `l'

[Katsumi Yamaoka <yamaoka@jpl.org>]

Hi,

I use the group level 1, 2 and 3 for the mail groups, the interesting
nntp groups, and the other nntp groups respectively.  Furthermore,
I use the level 4 for some foreign groups that take time to open.
I usually start Gnus as `C-u 2 M-x gnus', i.e., I usually read only
the mail groups and some news groups.  But when I want to read one
of the level 4 groups, I used to type `l' in the group buffer and
find it.  Now it doesn't work although the level is less than
`gnus-group-default-list-level'.  The server for those groups is not
shown in the server buffer.  I can use `L' instead of `l', or
the following advice.  But it's a bit inconvenient for me. :<

(defadvice gnus-group-prepare-flat (before list-all-groups activate)
  "Force list all groups."
  (unless (ad-get-arg 1)
    (ad-set-arg
     1
     (lambda (info)
       (<= (gnus-info-level info) (ad-get-arg 0))))))