Lines in CList

[Owen Taylor <otaylor redhat com>]

* The List widget has a nice clean look, with a white background.

* The CList widget looks like the cheap lined paper that one
  had to use in elementary school.

I'd like to make the default appearance for the CList just
like the List widget - no lines, and with a background
of base[] instead of background[PRELIGHT]. You can see
the effect of this in the new screenshots on 
http://www.gnome.org. 

If you don't approve of the color change, you probably
don't like coloring for List widgets either. So, by 
restoring consistency, this change will make it easier 
for you to get everything right with an appropriate gtkrc.


As for the lines, I'm a little relectant to completely
get rid of them, because some people might just like
the look when one has very wide rows. (Having them
on single column lists and trees is just silly).

(Ledger-style coloring might be a slicker way
to lead the eye and anyways, such help is less needed
and less useful then many people think (*) but
anyways...)

There are two ways of preserving the lines.

 - Make another hack sort of like the current one.
   draw the background in base[NORMAL] and the
   lines in base[ACTIVE]. It's unlikely that
   anybody will ever put a clist inside a button,
   and less care what that looks like when 
   pressed. This makes it easy to add lines back
   in a gtkrc.

 - Make it a widget-level option. This would
   allow applications that know that there lists
   would benefit from lines, and eventually, when
   we get the ability to set arguments in an
   RC file, allow themes to set them.

Comments?
                                        Owen

(*) Opiniated opinion.