comment-dwim bug

[Dan Nicolaescu]

In the current CVS version comment-dwim has a bug, it won't uncomment
correctly. 

To reproduce this save the following to test.el


(defvar ediff-force-faces nil
  "If t, Ediff will think that it is running on a display that supports faces.
This is provided as a temporary relief for users of face-capable displays
that Ediff doesn't know about.")

and then do

emacs -Q test.el

M-x transient-mark-mode RET
C-x h
M-;
C-x h
M-;

After the second M-; the defvar should be uncommented, but the last 2
lines of the docstring start with ;;
This does not happen with emacs-21.3