bug#19395: 25.0.50; Setting left fringe to 0 messes up window-width

[Eli Zaretskii]

> From: Titus von der Malsburg <malsburg@posteo.de>
> Cc: 19395@debbugs.gnu.org
> Date: Tue, 16 Dec 2014 19:28:45 -0800
> 
> I see, thanks for explaining.  Perhaps it would make sense to amend the
> documentation of `window-width' because this is easy to misunderstand

Will do.

> In term.el, I found a function that does what I want
> (`term-window-width') but requiring term.el only to use this
> function seems inappropriate.  Duplicating this function is not
> perfect either.

That function is in term.el because term.el is its only user.  We
might consider moving it to a more general place, but please describe
the use case where you needed it.