GNU bug report logs - #1469
term.el regression when dealing with long lines under bash

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From: Cyril Bouthors <cyril <at> bouthors.org>
To: emacs-pretest-bug <at> gnu.org
Cc: rfrancoise <at> debian.org, Dimitri Fontaine <dfontaine <at> hi-media.com>
Subject: bug#1469: term.el regression when dealing with long lines under bash
Date: Tue, 02 Dec 2008 14:35:17 +0100

term-mode is no longer able to handle long lines correctly with bash
under emacs-snapshot as it used to work under emacs22.

When a line wider than $COLUMNS+2 is displayed on the terminal, the
cursor is locked on the current line and does not move anymore until
/usr/bin/reset is ran.

I've been able to reproduce this bug when running bash, psql or csh
but not with zsh nor ksh.

I haven't been able to reproduce it under emacs22 at all.

Here's a short procedure to reproduce the bug:
 - Start Emacs: emacs-snapshot -Q
 - Start bash under term-mode: `M-: (term "/bin/bash") RET'
 - Display a long line under bash:
          width=$(($COLUMNS+2))
       for a in $(seq $width); do echo -n X; done; echo
 - Try to type any command on the terminal and you'll see the strange
   cursor behaviour

Long lines typically happen on a daily basis when your are reading
logfiles, running SQL queries, etc.

I hope I provided you with enough information.

In GNU Emacs 23.0.60.1 (x86_64-pc-linux-gnu, GTK+ Version 2.12.11)
 of 2008-11-29 on elegiac, modified by Debian
 (emacs-snapshot package, version 1:20081129-1)
Windowing system distributor `The X.Org Foundation', version 11.0.10502000
configured using `configure  '--build' 'x86_64-linux-gnu' '--host'
'x86_64-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
'--libexecdir=/usr/lib' '--localstatedir=/var'
'--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.60/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.60/site-lisp:/usr/share/emacs/site-lisp'
'--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=x86_64-linux-gnu'
'host_alias=x86_64-linux-gnu' 'CFLAGS=-DDEBIAN
-DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed'
'CPPFLAGS=''

Important settings:
  value of $LC_ALL: en_US.UTF-8
  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: Term

Minor modes in effect:
  tooltip-mode: t
  tool-bar-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
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<return> <return> <up> <return> <return> <return> <return>
<return> <S-return> <return> C-d M-x <up> t e r m <return>
<up> <M-backspace> b a s h <M-backspace> t c s <M-backspace>
c s h <return> <return> <return> <return> <return>
/ b i <backspace> <backspace> <backspace> . / b u <tab>
<tab> <backspace> <backspace> g / l o n g - l i n e
s . s h <return> <return> <return> <return> <return>
C-d M-x <up> <return> <up> <down> <up> C-g C-d M-x
b u <backspace> <backspace> r e p o r t - e m a c s
<tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Quit
#<buffer *terminal*>

-- 	
Cyril Bouthors

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