bug#22532: 25.0.90; Network Security Manager fails to restore window configuration after displaying warning

[N. Jackson]

When starting Gnus I get, correctly, a TLS connection insecure / bad
certificate warning from Network Security Manager.

When this warning is displayed, my frame is split vertically (by which I
mean two side-by-side windows) with, on the left, the window displaying
the Gnus logo and, on the right, the Network Security Manager window
describing the problem and looking rather like a help buffer.

After I respond to the prompt, the Network Security Manager buffer
disappears but its window is left behind. I am left with two copies of
the Gnus Group buffer side-by-side, and I am forced to close one of them
by hand.

I expect the Network Security Manager to clear up after itself and not
make a mess of my window configuration!

Note: If this is the designed behaviour -- I don't understand how it
could be, but I do see an entry in the Messages buffer than says "Type
C-x 1 to delete the help window." which suggests that it might be by
design -- then it might be better is the Network Security Manager buffer
remained as well as its window, because it does contain some useful
information.


In GNU Emacs 25.0.90.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.7)
 of 2016-01-31 built on moondust
Windowing system distributor 'Fedora Project', version 11.0.11800000
System Description:     Fedora release 23 (Twenty Three)

Configured using:
 'configure --prefix=/home/nlj/local/ --enable-checking=yes,glyphs
 'CFLAGS=-O0 -g3 -ggdb''

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: IBuffer

Minor modes in effect:
  recentf-mode: t
  display-battery-mode: t
  display-time-mode: t
  save-place-mode: t
  delete-selection-mode: t
  savehist-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:
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
Updating buffer list...done
Commands: m, u, t, RET, g, k, S, D, Q; q to quit; h for help

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Features:
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sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote dbusbind inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 445818 36101)
 (symbols 48 92167 0)
 (miscs 40 3534 7311)
 (strings 32 124964 12397)
 (string-bytes 1 4472051)
 (vectors 16 41652)
 (vector-slots 8 847536 15118)
 (floats 8 550 416)
 (intervals 56 1183 190)
 (buffers 976 41)
 (heap 1024 91230 2699))