bug#21386: 25.0.50; Make visual rectangular selection look better

[Eli Zaretskii <eliz@gnu.org>]

> From: Mark Karpov <markkarpov@openmailbox.org>
> Cc: 21386@debbugs.gnu.org, Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Tue, 01 Sep 2015 00:42:57 +0600
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Actually, I think this is the kind of an entry-level project that
> > could be a good first step for a newbie hacker of the display code.
> > Would someone please volunteer for the job?  Help will be happily
> > provided if needed.
> >
> > Come on, people!  We cannot have only one old curmudgeon on board able
> > and willing to do that; what if I'm run over by a bus or something?
> > What if I already have been?
> 
> I can try, I actually have good knowledge of Emacs Lisp and C

You are actually the best candidate, as you have the right
motivation.  Thanks in advance.

> So, maybe I could do that but not right now :-(

There's no particular rush.