bug#7552: 23.2; Emacs doesn't die when told to by X session manager

[Robin Green]

Until now, this would probably not matter, since normally when an X
session is stopped, all clients will be killed anyway. However, KDE 4.6
beta 1 allows the user to stop and start subsessions called "activities"
without logging out. When the KDE session manager tells emacs to die,
it should do so - but it doesn't, and as a consequence, the following
happens:

When you stop the activity in KDE, because the stopped activity isn't
currently visible, emacs is not visible on the display - but it still
remains running. Then if you restart the same activity, another copy of
emacs opens up, and the frame of the original emacs process reappears -
so you now have two emacs processes running, which is not what is
supposed to happen.

The X session management specification does anticipate subsessions
being used - indeed, it gives an example of them - but as far as I know,
they have not been widely used until now, which may explain why this bug
has gone unnoticed for many years.


In GNU Emacs 23.2.1 (i686-pc-linux-gnu, GTK+ Version 2.22.0)
 of 2010-11-18 on cspcnh.swan.ac.uk
Windowing system distributor `The X.Org Foundation', version 11.0.60900000
configured using `configure  '--prefix=/usr' '--host=i686-pc-linux-gnu' 
'--build=i686-pc-linux-gnu' '--mandir=/usr/share/man' 
'--infodir=/usr/share/info' '--datadir=/usr/share' 
'--docdir=/usr/share/doc/emacs-23.2-r1' '--sysconfdir=/etc' 
'--localstatedir=/var/lib' '--disable-dependency-tracking' 
'--disable-silent-rules' '--enable-fast-install' '--libdir=/usr/lib' 
'--infodir=/usr/share/info/emacs' '--without-kerberos' '--without-kerberos5' 
'--without-hesiod' '--without-m17n-flt' '--without-xim' '--with-x' 
'--without-sound' '--with-xft' '--with-x-toolkit=gtk' 
'--with-toolkit-scroll-bars' '--without-libotf' '--with-rsvg' '--with-dbus' 
'--without-gconf' '--with-gif' '--without-gpm' '--with-jpeg' '--with-png' 
'--without-tiff' '--with-xpm' 'build_alias=i686-pc-linux-gnu' 
'host_alias=i686-pc-linux-gnu' 'CC=i686-pc-linux-gnu-gcc' 'CFLAGS=-march=native 
-pipe -O2' 'CPP=cpp''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Fundamental

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

Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> M-x 
r e p o r t - e m a c s - b u g C-g <help-echo> M-x 
<up> r e p o r t - e m a c s - b u g <return>

Recent messages:
Loading /usr/share/emacs/site-lisp/haskell-mode/haskell-site-file...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Quit
goto-history-element: Beginning of history; no preceding item

Load-path shadows:
/usr/share/emacs/site-lisp/coq hides 
/usr/share/emacs/site-lisp/ProofGeneral/coq/coq
/usr/share/emacs/site-lisp/coq-syntax hides 
/usr/share/emacs/site-lisp/ProofGeneral/coq/coq-syntax
/usr/share/emacs/site-lisp/coq-db hides 
/usr/share/emacs/site-lisp/ProofGeneral/coq/coq-db
/usr/share/emacs/site-lisp/semi/pgg-gpg hides /usr/share/emacs/23.2/lisp/pgg-gpg
/usr/share/emacs/site-lisp/flim/hex-util hides 
/usr/share/emacs/23.2/lisp/hex-util
/usr/share/emacs/site-lisp/semi/pgg-parse hides 
/usr/share/emacs/23.2/lisp/pgg-parse
/usr/share/emacs/site-lisp/semi/pgg-pgp5 hides 
/usr/share/emacs/23.2/lisp/pgg-pgp5
/usr/share/emacs/site-lisp/flim/md4 hides /usr/share/emacs/23.2/lisp/md4
/usr/share/emacs/site-lisp/flim/sha1 hides /usr/share/emacs/23.2/lisp/sha1
/usr/share/emacs/site-lisp/semi/pgg hides /usr/share/emacs/23.2/lisp/pgg
/usr/share/emacs/site-lisp/semi/pgg-def hides /usr/share/emacs/23.2/lisp/pgg-def
/usr/share/emacs/site-lisp/semi/pgg-pgp hides /usr/share/emacs/23.2/lisp/pgg-pgp
/home/greenrd/org/lisp/org-ascii hides /usr/share/emacs/23.2/lisp/org/org-ascii
/home/greenrd/org/lisp/org-rmail hides /usr/share/emacs/23.2/lisp/org/org-rmail
/home/greenrd/org/lisp/org-freemind hides 
/usr/share/emacs/23.2/lisp/org/org-freemind
/home/greenrd/org/lisp/org-icalendar hides 
/usr/share/emacs/23.2/lisp/org/org-icalendar
/home/greenrd/org/lisp/org-agenda hides 
/usr/share/emacs/23.2/lisp/org/org-agenda
/home/greenrd/org/lisp/org-inlinetask hides 
/usr/share/emacs/23.2/lisp/org/org-inlinetask
/home/greenrd/org/lisp/org-crypt hides /usr/share/emacs/23.2/lisp/org/org-crypt
/home/greenrd/org/lisp/org-compat hides 
/usr/share/emacs/23.2/lisp/org/org-compat
/home/greenrd/org/lisp/org-exp-blocks hides 
/usr/share/emacs/23.2/lisp/org/org-exp-blocks
/home/greenrd/org/lisp/org-install hides 
/usr/share/emacs/23.2/lisp/org/org-install
/home/greenrd/org/lisp/org-remember hides 
/usr/share/emacs/23.2/lisp/org/org-remember
/home/greenrd/org/lisp/org-exp hides /usr/share/emacs/23.2/lisp/org/org-exp
/home/greenrd/org/lisp/org-src hides /usr/share/emacs/23.2/lisp/org/org-src
/home/greenrd/org/lisp/org-list hides /usr/share/emacs/23.2/lisp/org/org-list
/home/greenrd/org/lisp/org-datetree hides 
/usr/share/emacs/23.2/lisp/org/org-datetree
/home/greenrd/org/lisp/org-indent hides 
/usr/share/emacs/23.2/lisp/org/org-indent
/home/greenrd/org/lisp/org-publish hides 
/usr/share/emacs/23.2/lisp/org/org-publish
/home/greenrd/org/lisp/org-footnote hides 
/usr/share/emacs/23.2/lisp/org/org-footnote
/home/greenrd/org/lisp/org-macs hides /usr/share/emacs/23.2/lisp/org/org-macs
/home/greenrd/org/lisp/org hides /usr/share/emacs/23.2/lisp/org/org
/home/greenrd/org/lisp/org-mac-message hides 
/usr/share/emacs/23.2/lisp/org/org-mac-message
/home/greenrd/org/lisp/org-info hides /usr/share/emacs/23.2/lisp/org/org-info
/home/greenrd/org/lisp/org-table hides /usr/share/emacs/23.2/lisp/org/org-table
/home/greenrd/org/lisp/org-feed hides /usr/share/emacs/23.2/lisp/org/org-feed
/home/greenrd/org/lisp/org-id hides /usr/share/emacs/23.2/lisp/org/org-id
/home/greenrd/org/lisp/org-w3m hides /usr/share/emacs/23.2/lisp/org/org-w3m
/home/greenrd/org/lisp/org-faces hides /usr/share/emacs/23.2/lisp/org/org-faces
/home/greenrd/org/lisp/org-colview hides 
/usr/share/emacs/23.2/lisp/org/org-colview
/home/greenrd/org/lisp/org-html hides /usr/share/emacs/23.2/lisp/org/org-html
/home/greenrd/org/lisp/org-latex hides /usr/share/emacs/23.2/lisp/org/org-latex
/home/greenrd/org/lisp/org-attach hides 
/usr/share/emacs/23.2/lisp/org/org-attach
/home/greenrd/org/lisp/org-docbook hides 
/usr/share/emacs/23.2/lisp/org/org-docbook
/home/greenrd/org/lisp/org-wl hides /usr/share/emacs/23.2/lisp/org/org-wl
/home/greenrd/org/lisp/org-mhe hides /usr/share/emacs/23.2/lisp/org/org-mhe
/home/greenrd/org/lisp/org-habit hides /usr/share/emacs/23.2/lisp/org/org-habit
/home/greenrd/org/lisp/org-vm hides /usr/share/emacs/23.2/lisp/org/org-vm
/home/greenrd/org/lisp/org-timer hides /usr/share/emacs/23.2/lisp/org/org-timer
/home/greenrd/org/lisp/org-jsinfo hides 
/usr/share/emacs/23.2/lisp/org/org-jsinfo
/home/greenrd/org/lisp/org-bibtex hides 
/usr/share/emacs/23.2/lisp/org/org-bibtex
/home/greenrd/org/lisp/org-mouse hides /usr/share/emacs/23.2/lisp/org/org-mouse
/home/greenrd/org/lisp/org-clock hides /usr/share/emacs/23.2/lisp/org/org-clock
/home/greenrd/org/lisp/org-xoxo hides /usr/share/emacs/23.2/lisp/org/org-xoxo
/home/greenrd/org/lisp/org-gnus hides /usr/share/emacs/23.2/lisp/org/org-gnus
/home/greenrd/org/lisp/org-mobile hides 
/usr/share/emacs/23.2/lisp/org/org-mobile
/home/greenrd/org/lisp/org-irc hides /usr/share/emacs/23.2/lisp/org/org-irc
/home/greenrd/org/lisp/org-plot hides /usr/share/emacs/23.2/lisp/org/org-plot
/home/greenrd/org/lisp/org-mew hides /usr/share/emacs/23.2/lisp/org/org-mew
/home/greenrd/org/lisp/org-bbdb hides /usr/share/emacs/23.2/lisp/org/org-bbdb
/home/greenrd/org/lisp/org-protocol hides 
/usr/share/emacs/23.2/lisp/org/org-protocol
/home/greenrd/org/lisp/org-archive hides 
/usr/share/emacs/23.2/lisp/org/org-archive
/usr/share/emacs/site-lisp/flim/hmac-def hides 
/usr/share/emacs/23.2/lisp/net/hmac-def
/usr/share/emacs/site-lisp/flim/sasl-ntlm hides 
/usr/share/emacs/23.2/lisp/net/sasl-ntlm
/usr/share/emacs/site-lisp/flim/hmac-md5 hides 
/usr/share/emacs/23.2/lisp/net/hmac-md5
/usr/share/emacs/site-lisp/flim/sasl-cram hides 
/usr/share/emacs/23.2/lisp/net/sasl-cram
/usr/share/emacs/site-lisp/flim/sasl hides /usr/share/emacs/23.2/lisp/net/sasl
/usr/share/emacs/site-lisp/flim/ntlm hides /usr/share/emacs/23.2/lisp/net/ntlm
/usr/share/emacs/site-lisp/flim/sasl-digest hides 
/usr/share/emacs/23.2/lisp/net/sasl-digest
/usr/share/emacs/site-lisp/wl/rfc2368 hides 
/usr/share/emacs/23.2/lisp/mail/rfc2368
/usr/share/emacs/site-lisp/wl/utf7 hides /usr/share/emacs/23.2/lisp/gnus/utf7
/usr/share/emacs/site-lisp/semi/smime hides 
/usr/share/emacs/23.2/lisp/gnus/smime

Features:
(shadow sort mail-extr message sendmail ecomplete rfc822 mml mml-sec
password-cache mm-decode mm-bodies mm-encode mailcap mail-parse rfc2231
rfc2047 rfc2045 qp ietf-drums mailabbrev nnheader gnus-util netrc
mm-util mail-prsvr gmm-utils wid-edit mailheader canlock sha1 sha1-el
hex-util hashcash mail-utils emacsbug ob-sh shell ob-eval org-git-link
org byte-opt bytecomp byte-compile advice help-fns advice-preload
ob-emacs-lisp ob-tangle ob-ref ob-lob ob-table org-footnote org-src
ob-comint comint ob-keys ob org-list org-faces org-compat org-entities
org-macs time-date noutline outline cal-menu calendar cal-loaddefs
org-install avoid edmacro kmacro magit-topgit cl cl-19 magit-svn magit
diff-mode log-edit easymenu easy-mmode pcvs-util add-log magit-key-mode
assoc winner ring server site-exherbo eclectic-mode exheres-mode
exheres-mode-keywords skeleton sh-script executable dpaste cmake-mode
thingatpt bbdb-autoloads bbdb regexp-opt timezone proof-site
proof-autoloads pg-vars tooltip ediff-hook vc-hooks lisp-float-type
mwheel x-win x-dnd font-setting tool-bar dnd fontset image fringe
lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
mldrag 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 loaddefs button minibuffer faces cus-face files text-properties
overlay md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
font-render-setting gtk x-toolkit x multi-tty emacs)