Shell-mode: File completion breaks editing previous commands

[richard@rswheeldon.com]

Emacs shell mode allows editing of previous commands. These can then
be executed by pressing return. Shell mode also allows tab completion
to expand filenames. These do not work together. If we try to modify
a previously executed command (to re-execute it with different params)
and attempt to use filename completion, the beginning of the command
is lost.

For example, the following sequence:

touch foo bar
echo bar
Edit the echo command to "touch foo bar" and press return.

produces the following output:

% touch foo bar
% echo bar foo 
foo
% foo 
bash: ./foo: Permission denied
% 

This behaviour worked under Emacs 21.

Richard


In GNU Emacs 22.2.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2008-03-31 on belgrano
Windowing system distributor `The X.Org Foundation', version 11.0.10300000
configured using `configure  '--with-x' '--without-sound''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  value of $LC_CTYPE: en_GB.UTF-8
  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
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: Shell

Minor modes in effect:
  shell-dirtrack-mode: t
  delete-selection-mode: t
  pc-selection-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:

SPC SPC SPC SPC SPC SPC SPC <escape> x s h e l l <return> 
t o u c h SPC f o o b a <backspace> <backspace> SPC 
b a r <return> e c h o SPC f o <tab> <return> <up> 
<up> <right> <right> <right> <right> <right> b a <tab> 
<return> <escape> x <up> <up> <return>

Recent messages:
Completed
Completing file name...
Completed
Making completion list... [2 times]
Loading emacsbug...done
Mark set [2 times]
Completing file name...
Completed
Completing file name...
Completed