bug#23092: 25.0.92; Minibuffer completion fails to resize completion window if reused during same command

[N. Jackson]

When TAB is pressed during entry of a command in the minibuffer, a
window appears displaying a list of completions. To some extent this
window seems to be sized to fit the number of completions. If the
user enters more of the command and presses TAB again the contents
of the completions window are refreshed but the window is not resized.

This is impossible to use if there are very few completions when TAB
is pressed the first time, resulting in a very tiny window, and
there are very many completions when TAB is pressed the second time.
This can happen, for example, when finding a file.

For example, from the Emacs build directory:

    src/emacs -Q

    C-x C-f            ; find-file
    lib/v TAB          ; A tiny window pops up with "verify.h" and "vla.h."
    <backspace> s TAB

At this point there is still a tiny completions window with about 50
completions most of which are not visible in the window.

On the other hand,

    C-x C-f lib/s TAB

displays the same completions in a much larger completion window
(looks like it's half the frame height), so most of the available
completions can be seen.


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
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
  gnus-undo-mode: t
  recentf-mode: t
  display-battery-mode: t
  display-time-mode: t
  delete-selection-mode: t
  show-paren-mode: t
  savehist-mode: t
  save-place-mode: t
  electric-pair-mode: t
  desktop-save-mode: t
  cua-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent messages:
Reading active file from archive via nnfolder...
Opening nnfolder server on archive...done
Reading active file from archive via nnfolder...done
Reading active file via nnfolder...
Opening nnfolder server...done
Reading incoming mail from file...
nnfolder: Reading incoming mail (no new mail)...done
Reading active file via nnfolder...done
Checking new news...done
command-execute: Command attempted to use minibuffer while in minibuffer

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Features:
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