bug#7417: 24.0.50; Cannot move point to column zero in empty lines in tty frames

[Tassilo Horn]

Since some recent commit, I cannot move point to column 0 in tty frames,
if the current line contains only a \n.  Here's a recipe:

1. emacs -Q -nw

   You'll be put in *scratch*, line number 5.

2. Only for illustration: M-x column-number-mode

3. C-p to move point one line up.  Now, the mode line shows (4,0), but
   the cursor is actually printed in column 1.

   Inserting a character will put it before the cursor.

   After that, i.e. as soon as the line contains anything different from
   only a linebreak, the cursor is printed correctly again, that is, I
   can move to column 0 and it's also printed there.


In GNU Emacs 24.0.50.1 (x86_64-pc-linux-gnu)
 of 2010-11-16 on thinkpad
Windowing system distributor `The X.Org Foundation', version 11.0.10999001
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' '--program-suffix=-emacs-24' 
'--infodir=/usr/share/info/emacs-24' '--with-crt-dir=/usr/lib64' 
'--without-compress-info' '--with-sound' '--with-x' '--without-gconf' 
'--with-xml2' '--without-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=no' 
'--without-hesiod' '--without-kerberos' '--without-kerberos5' '--with-gpm' 
'--with-dbus' '--with-gnutls' '--without-selinux' 
'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu' 
'CFLAGS=-march=native -O2 -pipe' 'LDFLAGS=-Wl,-O1 -Wl,--as-needed' 'CPPFLAGS=''

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: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  TeX-source-correlate-mode: t
  gnus-topic-mode: t
  gnus-undo-mode: t
  diff-auto-refine-mode: t
  hl-line-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  recentf-mode: t
  window-number-meta-mode: t
  window-number-mode: t
  global-subword-mode: t
  subword-mode: t
  savehist-mode: t
  show-paren-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
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<up> <up> <up> C-c C-c <down> <return> M-2 <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
M-1 M-2 <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> M-1 ! q C-x b <return> 
M-x r e v e <tab> r t <tab> <return> y C-c C-c <return> 
C-c C-c <return> <return> C-x k <return> C-x b p r 
C-g C-c o a a C-x b p r <return> <up> <up> <up> <up> 
<tab> <tab> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<up> <up> <up> <down> <up> C-a <down> <return> <up> 
* * S-SPC T O D O S-SPC K ü n d i g u n g SPC a n SPC 
1 & 1 , SPC F r i s t SPC i s t SPC a b g e l a u f 
e n C-c C-s <S-right> <return> <down> <return> C-x 
C-s <up> <up> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
N a c h f <delete> C-x C-s C-x k <return> M-1 <return> 
c <return> c <return> c <return> c l s <down> <return> 
<return> <down> <return> <up> <return> q <return> q 
<up> <return> c l s <down-mouse-1> <mouse-1> <down-mouse-1> 
<mouse-movement> <drag-mouse-1> <up> M-x r e p <tab> 
o <tab> r <tab> <return>

Recent messages:
20101117T090844.770> Generating summary...done
20101117T090847.862> Exiting summary buffer and applying spam rules
20101117T090847.985> No more unread newsgroups
(No changes need to be saved)
20101117T090849.317> Saving /home/horn/.gnus.d/.newsrc.eld...
Saving file /home/horn/.gnus.d/.newsrc.eld...
Wrote /home/horn/.gnus.d/.newsrc.eld
20101117T090849.599> Saving /home/horn/.gnus.d/.newsrc.eld...done
Mark set
Making completion list... [2 times]

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Features:
(shadow emacsbug icalendar org-icalendar cal-move cal-iso gnus-dup
mule-util skeleton reftex-sel reftex-parse reftex-toc vc-svn preview
prv-emacs reftex-vcr reftex-dcr reftex-auc reftex reftex-vars tex-buf
tex-fold font-latex latex tex-style tex latexenc filecache mailalias
smtpmail qp newcomment xgit-dvc xgit xgit-annotate dvc-annotate xgit-log
tla smerge-mode dvc-state dvc-config dvc-diff dvc-fileinfo diff tla-gnus
dvc-gnus dvc-cmenu dvc-about dvc-version dvc-revlist bzr-core tla-core
tla-autoconf tla-defs dvc-log vc vc-dispatcher dvc-unified dvc-tips
ediff-merg ediff-diff ediff-wind ediff-help ediff-util ediff-mult
ediff-init ediff xdarcs-core xgit-core xhg-core xmtn-minimal sort smiley
ansi-color gnus-cite flow-fill gnus-async gnus-bcklg gnus-ml disp-table
gnus-topic nnml utf-7 nnimap parse-time utf7 nndraft nnmh bbdb-gnus
bbdb-snarf mail-extr nnnil gnus-agent gnus-srvr gnus-score score-mode
nnvirtual nntp gnus-cache spam spam-stat bbdb-com gnus-uu yenc gnus-msg
gnus-gravatar gnus-art mm-uu mml2015 mm-view smime password-cache dig
gravatar nnir gnus-sum nnoo gnus-group gnus-undo nnmail mail-source
th-private gnus-start gnus-spec gnus-int gnus-range gnus-win eldoc
go-mode-load flymake greqlscript-mode greql-mode tg-mode generic
th-latex paredit dvc-autoloads dvc-core dvc-lisp dvc-buffers dvc-ui
dvc-register dvc-utils dvc-emacs ewoc dvc-defs dvc-site magit diff-mode
log-edit pcvs-util add-log magit-key-mode epa-file epa epg epg-config
wtf cus-edit cus-start cus-load rdictcc org-location-google-maps
google-maps google-maps-static google-maps-geocode google-maps-base json
org-google-weather format-spec google-weather xml url-cache org-beamer
solar cal-dst holidays hol-loaddefs appt diary-lib diary-loaddefs vc-git
hl-line org-w3m org-irc org-jsinfo org-infojs org-html org-exp ob-exp
org-exp-blocks org-info org-gnus org-docview org-bibtex org-bbdb
org-protocol org-attach org-id org-agenda org ob-emacs-lisp ob-tangle
ob-ref ob-lob ob-table org-footnote org-src ob-comint ob-keys ob
org-list org-faces org-compat org-entities org-macs time-date
org-install cal-menu calendar cal-loaddefs dired-x dired-aux
highlight-symbol hi-lock th-boxquote boxquote rect ecomplete message
idna sendmail rfc822 mml mml-sec mm-decode mm-bodies mm-encode
mailabbrev gmm-utils mailheader info server auto-complete-config
auto-complete popup yasnippet dropdown-list help-mode view noutline
outline browse-kill-ring derived recentf tree-widget sr-speedbar
speedbar sb-image ezimage dframe assoc anything-config warnings compile
comint ring browse-url semantic/util-modes semantic/util semantic
semantic/tag semantic/lex semantic/fw eieio byte-opt bytecomp
byte-compile mode-local cedet imenu bookmark pp easymenu rx ffap
thingatpt anything window-number easy-mmode uniquify subword saveplace
savehist paren lusty-explorer dired cl edmacro kmacro advice help-fns
advice-preload th-common mm-url gnus gnus-ems nnheader mail-utils
wid-edit url-http tls url url-proxy url-privacy url-expand url-methods
url-history mailcap url-auth mail-parse rfc2231 rfc2047 rfc2045
ietf-drums url-cookie url-util url-parse auth-source netrc gnus-util
url-gw url-vars mm-util mail-prsvr windmove gnus-load site-gentoo
preview-latex bbdb-autoloads bbdb regexp-opt timezone tex-site
auto-loads tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win
x-dnd tool-bar dnd fontset image fringe 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 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 dynamic-setting font-render-setting x
multi-tty emacs)