[bug] Duplicate newsgroup

[Micha]

Versions:
  M-x gnus-version RET Gnus v5.11
  M-x emacs-version RET GNU Emacs 22.0.50.1 (i686-pc-linux-gnu)

How to:
  In *Group*, type:
     A A, to list all newsgroup on the server;
     u,   to subscribe to a new one;
     T m, to move the newly subscribed ng in a topic.

     You're done !

  The new newsgroup will be shown twice: in the selected topic, and in
  the root topic.

  Note that if  you kill the newsgroup in a  topic, it'll be destroyed
  in both.

-- 
   Michael Cadilhac, a.k.a. Micha                   *       +    - - --.
|      -Epita 2007 - Ing 1 - CSI-  @ r   '@'      *****     O `@       |
|                                 ,)´     (.    *********     `(.      |
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