bug#10062: 24.0.91; completions-first-difference

[Leo]

1. Emacs -q
2. (setq completion-cycle-threshold 4)
3. In the *scratch* buffer type "(push" without the double quotes
4. Type M-Tab a few times

You should see something like in the screenshot:

emacs-completion-face.png
Description: emacs-completion-face.png

BTW, I think the face property completions-first-difference should not
be rear-sticky. When that char is the last in the completion anything I
type after inherits it as seen in this screenshot:

emacs-slime-repl.png
Description: emacs-slime-repl.png

In GNU Emacs 24.0.91.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2011-11-09
Windowing system distributor `The X.Org Foundation', version 11.0.11004000
configured using `configure  'CFLAGS=-g' '--prefix=/usr/local/unix/emacs' 
'--with-wide-int' '--with-x-toolkit=lucid' '--without-gsettings''