The  aim  is  that `choose-completion-string'  will  `delete-region'
  everything from (+ base-size (point-min)) to (point-max).

  The added  function could  also directly erase  the region,  I don't
  know what's the best here. I don't even know if this way is ok ;-)

  Thanks in advance, however.

-- 
 |      Michaël `Micha' Cadilhac   |   Un certain Blaise Pascal             |
 |         Epita/LRDE Promo 2007   |     etc... etc...                      |
 | http://www.lrde.org/~cadilh_m   |   -- Prévert (Les paris stupides)      |
 `--  -   JID: micha@amessage.be --'                                   -  --'