bug#19334: 25.0.50; Display bug with zero width fringe

[Helmut Eller <eller.helmut@gmail.com>]

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When I start emacs with:

  emacs -Q -eval '(insert-char ?x 80)'

then, as expected, all the Xes are displayed in one line and the cursor
is displayed in the right fringe.

But when I start it with:

  emacs -Q -eval '(set-fringe-mode (cons 0 8))' -eval '(insert-char ?x 80)'

then two lines are used, the last column of the first line is empty, an
arrow appears in the right fringe, and the cursor is displayed in the
second column of the second line.  See attached screenshot.

The second case should be displayed almost like the first with all Xes
in one line.


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In GNU Emacs 25.0.50.10 (i686-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2014-12-10 on ix
Repository revision: 99be75085cec471fa35a811bddaf09fe91fc3452
Windowing system distributor `The X.Org Foundation', version 11.0.11204000
System Description:	Debian GNU/Linux 7.1 (wheezy)

Configured using:
 `configure --with-jpeg=no --with-gif=no --with-tiff=no'

Configured features:
XPM PNG RSVG SOUND DBUS GSETTINGS NOTIFY GNUTLS LIBXML2 FREETYPE XFT
ZLIB