bug#14357: 24.3; Directory tracking in ansi-term broken

[Olsen, Stuart J]

Using ansi-term's escape-code-based directory tracking causes extra data
to be displayed in local sessions.

To reproduce this bug, run emacs using the command `emacs -Q'. Issue the
command `M-x ansi-term' run a local bash session. Issue the command `echo
-e "\033AnSiTc" $(pwd)' to simulate setting the default-directory for
the ansi-term buffer. This will be successful, but the character
sequence `^Z/cwd', where cwd is the current working directory, will also
be printed. The same happens with the escape sequences to set the user
and hostname.

A possible candidate for this bug is the variable `handled-ansi-message'
in `term.el'. It appears as though this variable is set to true at line
2740 upon processing the directory-tracking escape sequence
(`^[AnSiT...'), which prevents the following escape sequence from being
processed at line 2902, causing this second escape sequence to be
printed to the terminal instead.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.4.2)
of 2013-04-13 on trouble, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11204000
System Description: Debian GNU/Linux 7.0 (wheezy)

Configured using:
`configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
'--localstatedir=/var/lib' '--infodir=/usr/share/info'
'--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
'--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
'--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
--param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall'
'LDFLAGS=-Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
value of $LC_CTYPE: en_US.UTF-8
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t

Major mode: Term

Minor modes in effect:
global-auto-complete-mode: t
goto-address-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:
M-x r e p <tab> o <tab> r <tab> <return>

Recent messages:
(lambda (dl) ...) quoted with ' rather than with #'
(lambda (mm) ...) quoted with ' rather than with #'
Loading /home/sjo/.emacs.d/powerline.el (source)...done
Loading /usr/share/emacs24/site-lisp/emacs-goodies-el/color-theme-library.el 
(source)...done
Loading 
/usr/share/emacs24/site-lisp/emacs-goodies-el/color-theme-library.elc...done
Loading /home/sjo/.emacs.d/visual-settings.el (source)...done
Loading /home/sjo/.emacs.d/term-settings.el (source)...done
Loading /home/sjo/.emacs.d/.mc-lists.el (source)...done
For information about GNU Emacs and the GNU system, type C-? C-a.
Making completion list... [2 times]

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Features:
(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-mode yasnippet-autoloads package
auto-complete-config auto-complete popup multiple-cursors
mc-separate-operations rectangular-region-mode mc-mark-more
mc-cycle-cursors mc-edit-lines multiple-cursors-core rect goto-addr
thingatpt term disp-table ehelp electric ring info color-theme easymenu
wid-edit powerline cl-macs gv cl advice help-fns cl-lib advice-preload
edmacro kmacro slime-autoloads org-install emacs-goodies-el
emacs-goodies-custom emacs-goodies-loaddefs easy-mmode 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)