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

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: malsburg@posteo.de,  19395@debbugs.gnu.org
> Date: Thu, 18 Dec 2014 09:25:33 -0500
> 
> >> >   |left-to-right continued line |⤶
> >> >   |/RIGHT-TO-LEFT CONTINUED LINE|
> >> Why do you need the empty space at the end of the left-to-right line?
> > Because that empty space simply doesn't exist in the display line's
> > geometry, as far as the display engine is concerned.  Most of the
> > display engine is oblivious to the fact that an RTL line is reversed
> > on display, so it cannot do its job if some lines are longer than
> > others.
> 
> IOW, it's because it makes the implementation easier.

No, it makes it possible.