bug#12930: 24.3.50; Vertical line movement problem with display property and line-move-visual

[Tassilo Horn]

The `vertical-motion' function (called by `next-line' / `previous-line')
makes point jump to wrong positions if `line-move-visual' is t and the
visual column it should jump to is inside text with display property.

Here's a recipe to reproduce the problem:

  1. emacs -Q
  2. Create some test buffer: C-x b foo RET
  3. Evaluate the following code using M-:

--8<---------------cut here---------------start------------->8---
(progn
  (visual-line-mode 1)
  (insert "\n\nbla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla 
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla 
bla bla bla bla bla bla bla bla bla")
  (insert (propertize "bla bla bla bla bla bla bla bla bla bla bla bla bla bla 
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla 
bla bla bla bla bla bla bla bla bla bla bla" 'display "[folded]" 'face 'bold))
  (insert "bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla 
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla 
bla bla bla bla bla bla bla bla"))
--8<---------------cut here---------------end--------------->8---

  4. Try to move point vertically thru the "[folded]" text.

When I do that from above, point jumps one line back again.  When I do
it from below, point jumps to the line before the beginning of the
complete paragraph.



In GNU Emacs 24.3.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.4.4)
 of 2012-11-18 on thinkpad
Bzr revision: eliz@gnu.org-20121118165431-fkh83ayq34aqdz36
Windowing system distributor `The X.Org Foundation', version 11.0.11300000
System Description:     NAME=Gentoo

Configured using:
 `configure '--prefix=/usr' '--build=x86_64-pc-linux-gnu'
 '--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man'
 '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc'
 '--localstatedir=/var/lib' '--libdir=/usr/lib64'
 '--disable-dependency-tracking' '--program-suffix=-emacs-24-vcs'
 '--program-transform-name=s/emacs-[0-9].*/emacs-24-vcs/'
 '--infodir=/usr/share/info/emacs-24-vcs'
 '--enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/../../../../lib64'
 '--with-gameuser=games' '--without-compress-info' '--without-hesiod'
 '--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus'
 '--with-gnutls' '--with-xml2' '--without-selinux' '--without-wide-int'
 '--with-sound' '--with-x' '--without-ns' '--without-gconf'
 '--with-gsettings' '--with-toolkit-scroll-bars' '--with-gif'
 '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' '--with-xpm'
 '--with-imagemagick' '--with-xft' '--with-libotf' '--with-m17n-flt'
 '--with-x-toolkit=gtk3'
 'GENTOO_PACKAGE=app-editors/emacs-vcs-24.3.9999' 'EBZR_BRANCH=trunk'
 'EBZR_REVNO=110942' 'build_alias=x86_64-pc-linux-gnu'
 'host_alias=x86_64-pc-linux-gnu' 'CFLAGS=-march=native -pipe -g3 -ggdb'
 'LDFLAGS=-Wl,-O1 -Wl,--as-needed' 'CPPFLAGS=''

Important settings:
  value of $LC_COLLATE: C
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  gnus-agent-summary-mode: t
  rcirc-track-minor-mode: t
  TeX-source-correlate-mode: t
  shell-dirtrack-mode: t
  helm-match-plugin-mode: t
  hl-line-mode: t
  global-edit-server-edit-mode: t
  recentf-mode: t
  global-subword-mode: t
  subword-mode: t
  savehist-mode: t
  show-paren-mode: t
  minibuffer-depth-indicate-mode: t
  window-number-meta-mode: t
  global-yascroll-bar-mode: t
  yascroll-bar-mode: t
  tooltip-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
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
e SPC o n l y SPC t h e SPC : <backspace> e n a b l 
e SPC m i n o r <M-backspace> <M-backspace> <M-backspace> 
<M-backspace> t h e SPC e n a b l i n g SPC o f SPC 
a SPC m u i n <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
C-c C-c y c l s g g <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <return> 
<return> <tab> <tab> <tab> <tab> <return> <down-mouse-1> 
<mouse-1> F C-k C-k C-k H i ! <return> <down> M-q <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <down> 
<left> <M-return> E i e i e i , SPC n i c h t SPC s 
e h r SPC g i t <backspace> <backspace> u t . <down> 
<down> <down> <down> <return> V o n SPC m u r <backspace> 
<backspace> i r SPC a u s SPC s p r e c h t <backspace> 
<backspace> <backspace> <backspace> i c h t SPC n i 
c h t s SPC d a g e g e n . <return> <return> v g <tab> 
C-c C-c y <down> <return> <tab> <tab> <return> q <down> 
<down> <down> <down> <return> <return> q l s <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <return> <return> <return> <return> 
<return> <return> <return> <return> ! M-x r e p o r 
t <tab> e m a <tab> <return>

Recent messages:
20121119T141244.933> Saving Gnus registry (size 12418) to 
~/.gnus.d/.gnus.registry.eioio...done
(No changes need to be saved)
20121119T141244.935> Saving /home/horn/.gnus.d/.newsrc.eld...
Saving file /home/horn/.gnus.d/.newsrc.eld...
Wrote /home/horn/.gnus.d/.newsrc.eld
20121119T141245.024> Saving /home/horn/.gnus.d/.newsrc.eld...done
20121119T141249.318> Opening nntp server on Gmane...
gnutls.c: [1] Note that the security level of the Diffie-Hellman key exchange 
has been lowered to 256 bits and this may allow decryption of the session data

20121119T141249.754> Opening nntp server on Gmane...done

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Features:
(shadow emacsbug mailalias smtpmail sendmail rs-info descr-text vc-bzr
find-dired cc-langs cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles
cc-align cc-engine cc-vars cc-defs edebug rcirc-controls rcirc-late-fix
rcirc calc-alg calc-ext calc-menu calc calc-loaddefs calc-macs timezone
etags org-element canlock hippie-exp vc-cvs texmathp cus-start cus-load
tex-fold reftex-ref reftex-parse adaptive-wrap preview prv-emacs
reftex-dcr reftex-auc reftex reftex-vars tex-buf font-latex latex
tex-style tex latexenc filecache bookmark gnus-notifications gnus-fun
notifications dbus misearch multi-isearch debug jka-compr pp flow-fill
mule-util mm-archive url-http url-gw url-auth sort smiley gnus-cite
gnus-async gnus-bcklg qp gnus-ml nndraft nnmh rot13 utf-7 gnutls
network-stream starttls nnimap parse-time tls utf7 netrc nnml nnnil
gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-cache
gnus-demon nntp spam spam-stat gnus-uu yenc gnus-msg gnus-gravatar
mail-extr gravatar gnus-topic nnir gnus-registry registry eieio-base
th-private helm-misc helm-files image-dired tramp tramp-compat
tramp-loaddefs shell dired-aux ffap helm-tags helm-bookmark
helm-adaptative helm-info helm-net browse-url helm-plugin helm-locate
helm-help helm-match-plugin helm-external eldoc go-mode-load greql-mode
tg-mode generic preview-latex tex-site auto-loads paredit epa-file epa
google-translate ido rdictcc appt vc-git hl-line org-mobile org-capture
org-mks org-irc org-info org-gnus org-docview org-bibtex bibtex
org-protocol org-attach org-id org-icalendar org-exp ob-exp org-habit
calfw-ical icalendar calfw-org org-agenda calfw holidays hol-loaddefs
diary-lib diary-loaddefs org ob-tangle ob-ref ob-lob ob-table
org-footnote org-src ob-comint ob-keys org-pcomplete pcomplete org-list
org-faces org-entities org-version ob-emacs-lisp ob org-compat org-macs
ob-eval org-loaddefs find-func cal-menu calendar cal-loaddefs
google-contacts-message google-contacts-gnus gnus-art mm-uu mml2015
mm-view mml-smime smime dig gnus-sum nnoo gnus-group gnus-undo nnmail
mail-source gnus-start gnus-spec gnus-int gnus-range gnus-win gnus
gnus-ems gnus-compat nnheader google-contacts xml oauth2 json plstore
epg epg-config url-cache url url-proxy url-privacy url-expand
url-methods url-history url-cookie url-domsuf mailcap url-util url-parse
auth-source gnus-util password-cache url-vars google-oauth dired-x
highlight-symbol hi-lock thingatpt boxquote rect ecomplete message idna
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 info edit-server server yasnippet
dropdown-list derived assoc help-mode disp-table noutline outline
browse-kill-ring recentf tree-widget wid-edit helm-buffers helm-grep
helm-regexp grep helm-elscreen helm-utils compile comint ansi-color ring
helm helm-config easymenu uniquify easy-mmode iedit help-macro iedit-lib
cl-macs gv subword saveplace savehist highlight-parentheses paren
lusty-explorer dired mb-depth advice help-fns rx window-number cl
nadvice cl-lib yascroll edmacro kmacro gnus-load adaptive-wrap-autoloads
boxquote-autoloads browse-kill-ring-autoloads clojure-mode-autoloads
debbugs-autoloads full-ack-autoloads gist-autoloads gh-autoloads eieio
byte-opt bytecomp byte-compile cconv git-commit-autoloads
graphviz-dot-mode-autoloads highlight-parentheses-autoloads
highlight-symbol-autoloads logito-autoloads markdown-mode-autoloads
oauth2-autoloads paredit-autoloads pastebin-autoloads pcache-autoloads
finder-inf window-number-autoloads yascroll-autoloads package
site-gentoo time-date tooltip 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 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 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 dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)