bug#20472: 24.4; Cannot switch buffers in a dedicated window - report this error earlier

[Ed Avis]

Sometimes Emacs creates a small window such as *log-edit-files*.
If you go to that window and do C-x b, you enter the name of the buffer
to switch to as usual, but then see the error

    Cannot switch buffers in a dedicated window

This error message should appear earlier, as soon as C-x b is given.
Emacs should not ask you to type in the new buffer name before it tells
you that switching buffers is not allowed.



In GNU Emacs 24.4.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.10.9)
 of 2014-11-03 on wcl-linux04.wcl.local
Configured using:
 `configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-linux-gnu --program-prefix=
 --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
 --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
 --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
 --libexecdir=/usr/libexec --localstatedir=/var
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
 --with-gpm=no build_alias=x86_64-redhat-linux-gnu
 host_alias=x86_64-redhat-linux-gnu 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g
 -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
 -fstack-protector-strong --param=ssp-buffer-size=4
 -grecord-gcc-switches -m64 -mtune=generic' 'LDFLAGS=-Wl,-z,relro ''

Important settings:
  value of $LC_COLLATE: C
  value of $LC_CTYPE: en_GB.UTF-8
  value of $LC_MESSAGES: en_GB.UTF-8
  value of $LC_MONETARY: en_GB.UTF-8
  value of $LC_NUMERIC: en_GB.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
SPC c g TAB C-a C-k C-x b G u TAB RET . TAB RET C-x 
v = ESC [ 6 ~ ESC [ 5 ~ C-x o C-x o C-x v = C-x v v 
R e d u c e SPC DEL d SPC f i l l i n g SPC f r o m 
SPC 1 0 0 SPC t o SPC 3 0 SPC d a t DEL y s SPC f o 
r SPC s o m e SPC m o n t h l y SPC s t r a t e g i 
e s . RET T h i s SPC c a n SPC b e SPC d o n e SPC 
n o w SPC t h e SPC h DEL g a p s SPC i n SPC C o n 
s e n e s u s DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL 
C-x o C-x b b u TAB RET C-g C-g C-g C-x b b u TAB RET 
C-g C-g C-g C-x o C-x b b u TAB C-g C-x o C-x o C-x 
b * l o TAB g - e TAB C-g C-x b C-g C-x o C-x o C-x 
o ESC x C-g C-x b f a RET C-x b g g RET C-g C-g C-x 
o C-x b g g RET C a n n o t SPC s w i t c h SPC b u 
f f e r s SPC i n SPC a SPC d e d i c a t e d SPC w 
i n d o w C-x o C-x o C-x o C-@ C-a ESC w ESC x r e 
p o r SPC e SPC b SPC RET

Recent messages:
Press C-c C-c when you are done editing.
Enter a change comment.  Type C-c C-c when done
user-error: Cannot switch buffers in a dedicated window
Quit [3 times]
user-error: Cannot switch buffers in a dedicated window
Quit [4 times]
Making completion list...
Quit [3 times]
user-error: Cannot switch buffers in a dedicated window [2 times]
Quit [2 times]

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug sendmail warnings dired-aux vc-bzr
vc-sccs vc-svn vc-cvs vc-rcs mule-util macros smerge-mode rect novice
edmacro kmacro etags log-view nxml-uchnm rng-xsd xsd-regexp rng-cmpct
rng-nxml rng-valid rng-loc rng-uri rng-parse nxml-parse rng-match rng-dt
rng-util rng-pttrn nxml-ns nxml-mode nxml-outln nxml-rap nxml-util
nxml-glyph nxml-enc xmltok sql view diff-mode vc vc-dispatcher tabify
imenu man sh-script smie executable pcmpl-rpm dabbrev ffap thingatpt
url-parse auth-source eieio eieio-core gnus-util password-cache url-vars
nroff-mode help-mode dired misearch multi-isearch vc-git cus-edit
wid-edit cus-start cus-load perl-mode pcmpl-unix xterm time-date
log-edit easy-mmode message format-spec rfc822 mml mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader pcvs-util
add-log server csharp-mode advice help-fns byte-opt bytecomp
byte-compile cconv cc-langs cc-mode cc-fonts easymenu cc-guess cc-menus
cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs zoom-frm frame-cmds
frame-fns cl-macs avoid cl gv cl-loaddefs cl-lib compile shell pcomplete
comint ring ansi-color tooltip electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
gfilenotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 1254638 183358)
 (symbols 48 29960 0)
 (miscs 40 760 4364)
 (strings 32 63447 13092)
 (string-bytes 1 3117305)
 (vectors 16 32306)
 (vector-slots 8 1444102 177426)
 (floats 8 560 1031)
 (intervals 56 189950 392)
 (buffers 960 151)
 (heap 1024 93365 1704))

-- 
Ed Avis <eda@waniasset.com>
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