bug#22786: 25.1.50; eww arabic rendering

[Eli Zaretskii]

> Date: Sun, 28 Feb 2016 17:41:13 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 22786@debbugs.gnu.org, mohamed.hibti@gmail.com
> 
> > > In any case, I think it will be good to add a "Switch page direction"
> > > menu item to EWW on the emacs-25 branch.
> > 
> > Good idea; I'll all that.
> 
> Thanks.

Except that I think it shouldn't be a toggle, but a tristate: nil is
also a useful value for bidi-paragraph-direction in this context.

TIA