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bug#25150: 26.0.50; sexp motion commands don't work reliably in message-


From: Sean McAfee
Subject: bug#25150: 26.0.50; sexp motion commands don't work reliably in message-mode
Date: Fri, 09 Dec 2016 12:18:45 -0800

Starting from "emacs -Q":

Open a new buffer.

M-x message-mode.

Enter the following two lines of text:

{"":[
]}

Press C-M-b (backward-sexp).

Point should move to the opening brace, but instead it moves to the opening 
square bracket.

Move point to the opening brace and press C-M-f (forward-sexp).

Point should move to the closing brace, but an "unbalanced parentheses" error 
is raised instead.

If the two lines are joined:

{"":[]}

...then both commands work as expected.

If you enter the two-line text above and THEN enter message-mode, the two sexp 
motion commands work as expected.  But if you then enter any additional single 
character in the buffer, the commands behave incorrectly again, as described 
above.



In GNU Emacs 26.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2016-10-06 built on sean-virtualbox
Repository revision: d48369db9c97b6f2accf702e5bbe0bda11cb92a1
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:     Ubuntu 16.04.1 LTS

Recent messages:
Mark set [2 times]
forward-sexp: Scan error: "Unbalanced parentheses", 157, 165
Mark set
next-line: End of buffer
Mark set
Mark activated
next-line: End of buffer
Mark set
forward-sexp: Scan error: "Unbalanced parentheses", 1, 7
previous-line: Beginning of buffer
forward-sexp: Scan error: "Unbalanced parentheses", 157, 165
Configured using:
 'configure --with-xwidgets'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XWIDGETS

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Summary

Minor modes in effect:
  recentf-mode: t
  global-anzu-mode: t
  anzu-mode: t
  volatile-highlights-mode: t
  dtrt-indent-mode: t
  projectile-global-mode: t
  projectile-mode: t
  diff-auto-refine-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  google-this-mode: t
  global-flycheck-mode: t
  minibuffer-depth-indicate-mode: t
  ido-everywhere: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  override-global-mode: t
  show-paren-mode: t
  electric-pair-mode: t
  savehist-mode: t
  desktop-save-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-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
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/smcafee1/.emacs.d/elpa/svg-0.1/svg hides 
/usr/local/share/emacs/26.0.50/lisp/svg
/home/smcafee1/.emacs.d/elpa/scala-mode-20160902.525/ob-scala hides 
/usr/local/share/emacs/26.0.50/lisp/org/ob-scala
~/emacs/japanese hides /usr/local/share/emacs/26.0.50/lisp/language/japanese

Features:
(shadow emacsbug mailalias sort pcmpl-unix eieio-opt speedbar sb-image
ezimage dframe debug cus-edit cus-start cus-load proced tabify
org-datetree image-file org-capture gnus-async align gnus-cite mail-extr
nnir gnus-ml disp-table nndraft nnmh nnfolder utf-7 gnus-agent gnus-srvr
gnus-score score-mode nnvirtual gnus-msg gnus-art mm-uu mml2015 mm-view
mml-smime smime dig nntp gnus-cache gnus-sum gnus-group gnus-undo
gnus-start gnus-cloud nnimap nnmail mail-source utf7 netrc nnoo
parse-time gnus-spec gnus-int gnus-range gnus-win pulse vc-annotate
vc-bzr vc-src vc-sccs vc-cvs vc-rcs mc-edit-lines ag vc-svn find-dired
url-cache url-http url-auth vc vc-dispatcher bookmark misearch
multi-isearch network-stream nsm starttls tls gnutls executable recentf
tree-widget linum python-el-fgallina-expansions python rng-xsd
xsd-regexp rng-cmpct nxml-mode-expansions 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-enc xmltok perl6-mode
perl6-indent smie perl6-font-lock org-element org-rmail org-mhe org-irc
org-info org-gnus org-docview doc-view jka-compr image-mode org-bibtex
bibtex org-bbdb org-w3m the-org-mode-expansions org org-macro
org-footnote org-pcomplete org-list org-faces org-entities org-version
ob-emacs-lisp ob ob-tangle ob-ref ob-lob ob-table ob-exp org-src ob-keys
ob-comint ob-core ob-eval org-compat org-macs org-loaddefs cal-menu
calendar cal-loaddefs json-mode json-reformat json-snatcher
js-mode-expansions js tagedit html-mode-expansions sgml-mode dom
cc-mode-expansions cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles
cc-align cc-engine cc-vars cc-defs gnus-dired vc-git cap-words superword
subword company-oddmuse company-keywords company-etags company-gtags
company-dabbrev-code company-dabbrev company-files company-capf
company-cmake company-xcode company-clang company-semantic company-eclim
company-template company-css company-nxml company-bbdb ensime-company
yasnippet company scala-mode scala-mode-prettify-symbols
scala-mode-imenu scala-mode-map scala-mode-fontlock scala-mode-indent
scala-mode-paragraph scala-mode-lib anzu perl6-detect restclient edbi
sql view epc ctable concurrent deferred smtpmail-multi smtpmail
whitespace ensime ensime-sbt sbt-mode sbt-mode-rgrep sbt-mode-comint
sbt-mode-buffer sbt-mode-project sbt-mode-vars ensime-http ensime-ui
ensime-semantic-highlight ensime-doc ensime-search ensime-undo
ensime-startup ensime-refactor ensime-popup ensime-notes ensime-model
ensime-mode ensime-inspector imenu ensime-goto-testfile ensime-editor
popup ensime-debug gdb-mi bindat gud ensime-stacktrace ensime-inf
ensime-completion-util scala-mode-syntax ensime-config ensime-util
ensime-client ensime-vars hideshow pp arc-mode archive-mode url-gw
ensime-macros dash-functional volatile-highlights iedit iedit-lib
multiple-cursors-core rect dtrt-indent projectile grep ibuf-ext ibuffer
ibuffer-loaddefs elisp-slime-nav magit-blame magit-stash magit-bisect
magit-remote magit-commit magit-sequence magit magit-apply magit-wip
magit-log magit-diff smerge-mode diff-mode magit-core magit-autorevert
autorevert filenotify magit-process magit-popup magit-mode magit-git crm
magit-section magit-utils git-commit help-fns radix-tree log-edit
message sendmail puny rfc822 mml mml-sec epa derived epg mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
pcvs-util add-log with-editor async-bytecomp async tramp-sh tramp
tramp-compat tramp-loaddefs trampver shell pcomplete format-spec
google-this url url-proxy url-privacy url-expand url-methods url-history
url-cookie url-domsuf mailcap flycheck find-func gnus nnheader subr-x
gnus-util rmail rmail-loaddefs rfc2047 rfc2045 ietf-drums mail-utils
mm-util mail-prsvr wid-edit haskell-interactive-mode
haskell-presentation-mode haskell-collapse haskell-process
haskell-session url-util haskell-navigate-imports haskell-compile
haskell-mode haskell-cabal haskell-utils haskell-font-lock
haskell-indentation haskell-string haskell-sort-imports haskell-lexeme
haskell-align-imports haskell-compat haskell-complete-module
haskell-ghc-support noutline outline flymake etags xref project dabbrev
haskell-customize autoinsert misc sanityinc-tomorrow-blue-theme
color-theme-sanityinc-tomorrow mb-depth ido dired-details+ dired
dired-loaddefs dired-details change-inner expand-region
text-mode-expansions er-basic-expansions expand-region-core advice
expand-region-custom org-bullets undo-tree diff ack compile paredit
edmacro kmacro use-package diminish bind-key easy-mmode finder-inf
gh-common gh-profile s ucs-normalize marshal eieio-compat ht json map
dash rx info package epg-config url-handlers url-parse auth-source eieio
eieio-core eieio-loaddefs password-cache url-vars seq byte-opt bytecomp
byte-compile cl-extra help-mode easymenu cconv paren elec-pair savehist
desktop frameset server hippie-exp comint ansi-color ring thingatpt
cl-seq perl-mode cl-macs cl gv cl-loaddefs pcase cl-lib time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list newcomment elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese charscript case-table epa-hook jka-cmpr-hook help simple abbrev
obarray minibuffer cl-preloaded 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
dbusbind inotify dynamic-setting system-font-setting font-render-setting
xwidget-internal move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 936252 96426)
 (symbols 48 68963 3)
 (miscs 40 20187 1648)
 (strings 32 209317 35304)
 (string-bytes 1 6619591)
 (vectors 16 105692)
 (vector-slots 8 2288221 97129)
 (floats 8 1125 1820)
 (intervals 56 20768 188)
 (buffers 976 128)
 (heap 1024 103678 11159))





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