bug#18601: 24.3.94; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS

[Eli Zaretskii]

> From: Constantine Vetoshev <vetoshev@gmail.com>
> Date: Fri, 3 Oct 2014 10:55:29 -0700
> Cc: 18601@debbugs.gnu.org
> 
> On Thu, Oct 2, 2014 at 11:54 PM, martin rudalics <rudalics@gmx.at> wrote:
> > What happens when you make it always return (window-body-width)?
> >
> > (defun term-window-width ()
> >   (window-body-width))
> 
> Tried that. The same rendering bug occurs.

I think you should correct term-window-width to subtract 1 from the
width when any fringe has zero width, not just the right fringe.