bug#23093: 25.0.92; Change for the worse: minibuffer completion window splits below rather that right

[N. Jackson]

In Emacs 24 when using completion in the minibuffer, when the frame is
sufficiently wide it is split vertically (into side-by-side windows)
with the completions in the window on the right.

There seems to have been an (undocumented?) behaviour change -- now when
using completion in the minibuffer the frame seems always to be split
horizontally (into above-and-below windows) with the completions in the
lower window.

This change does not seem to me to be an improvement, as now far fewer
of the available completions are visible at once.

I suppose whether a "portrait" or "landscape" completions window is
better probably depends on the number and length of the completions and
also on the user's frame size, so presumably the splitting behaviour
should be a user option.

As long as the option is available and documented, I have no opinion on
the default, although it would seem more compatible to make it default
to the old behaviour.


In GNU Emacs 25.0.92.3 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2016-03-21 built on moondust
Windowing system distributor 'Fedora Project', version 11.0.11801000
System Description:     Fedora release 23 (Twenty Three)

Configured using:
 'configure --prefix=/usr/local/ --enable-checking=yes,glyphs
 --enable-check-lisp-object-type 'CFLAGS=-O0 -g3 -gdwarf-4''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: en_DK.utf8
  value of $LC_NUMERIC: en_DK.utf8
  value of $LC_TIME: en_DK.utf8
  value of $LANG: en_CA.UTF-8
  value of $XMODIFIERS: @im=ibus
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Major mode: Group

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  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent messages:
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