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bug#17210: 24.3.50; help mode [back] link to a C-h b keybind listing fai

From: Ian Kelling
Subject: bug#17210: 24.3.50; help mode [back] link to a C-h b keybind listing fails with message "Current buffer is not in Help mode"
Date: Sun, 06 Apr 2014 16:47:36 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131103 Icedove/17.0.10

Repro steps:
emacs -Q
C-h b
click function name link
click back

go back to the C-h b keymap listing

in echo area: "Current buffer is not in Help mode"
the help buffer does no change.

The problem does not always happen, but it seems consistent on the first try in 
fresh emacs. Toggling debug on error, gives this trace:

Debugger entered--Lisp error: (error "Current buffer is not in Help mode")
  signal(error ("Current buffer is not in Help mode"))
  error("Current buffer is not in Help mode")
  describe-bindings-internal(nil nil)
  describe-bindings(nil #<buffer *scratch*>)
  apply(describe-bindings (nil #<buffer *scratch*>))
  help-xref-go-back(#<buffer *Help*>)
  apply(help-xref-go-back #<buffer *Help*>)
  help-do-xref(63 help-xref-go-back (#<buffer *Help*>))
  help-button-action(#<marker (moves after insertion) at 66 in *Help*>)
  button-activate(#<marker (moves after insertion) at 66 in *Help*> nil)
  push-button((mouse-2 (#<window 6 on *Help*> 66 (34 . 106) 107906261 nil 66 (3 
5) nil (7 . 11) (9 . 19))))
  call-interactively(push-button nil nil)

In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 3.4.2)
 of 2014-03-18 on treetowl
Repository revision: 116779 address@hidden
Windowing system distributor `The X.Org Foundation', version 11.0.11204000
System Description:     Debian GNU/Linux 7.4 (wheezy)

Configured using:
 `configure --enable-link-time-optimization 'CFLAGS=-std=gnu99 -g3 -O2''

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-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
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-h b <help-echo> <help-echo> <down-mouse-2> <mouse-1>
<help-echo> <down-mouse-2> <mouse-1> <help-echo> M-x
r e C-g M-x b u g <kp-add> <backspace> <tab> <tab>
<backspace> <backspace> <backspace> <backspace> <backspace>
<backspace> <backspace> <backspace> <backspace> <backspace>
<backspace> <backspace> <backspace> <backspace> r e
p o r t - b <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Type C-x 1 to delete the help window, C-M-v to scroll help.

help-buffer: Current buffer is not in Help mode
Making completion list...
call-interactively: End of buffer

Load-path shadows:
None found.

(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils help-fns kmacro two-column iso-transl help-mode
easymenu time-date 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)

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