GNU bug report logs - #12826
24.2.50; M-x term, delete-backward-char doesn't delete input when rebound to non-backspace key doesn't

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Maciek Pacut <maciek.pacut <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2.50; M-x term
Date: Wed, 7 Nov 2012 19:17:55 +0100

I binded delete-backward-char to other key than backspace and deleting
text in M-x term doesn't work as it should. when I write e.g. "aoeui" and then
remove "aoeui" and type "ls" terminal tries to launch command "aoeuils". This
is an issue also with emacs -q and running command
(global-set-key (kbd "C-.") 'delete-backward-char)

In GNU Emacs 24.2.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.4.2)
 of 2012-10-26 on peryton, modified by Debian
 (emacs-snapshot package, version 2:20121025-1~ppa1~precise1)
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
System Description:	Ubuntu 12.04.1 LTS

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/24.2.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.2.50/site-lisp:/usr/share/emacs/site-lisp'
 '--without-compress-info' '--with-crt-dir=/usr/lib/x86_64-linux-gnu/'
 '--with-x=yes' '--with-x-toolkit=gtk3' '--with-imagemagick=yes'
 '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 -znocombreloc' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

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

Major mode: Emacs-Lisp

Minor modes in effect:
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  global-auto-revert-mode: t
  ido-everywhere: t
  show-paren-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<mouse-5> <double-down-mouse-5> <double-mouse-5> <triple-down-mouse-5>
<triple-mouse-5> <down-mouse-5> <mouse-5> <double-down-mouse-5>
<double-mouse-5> <down-mouse-4> <mouse-4> <double-down-mouse-4>
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4>
<triple-down-mouse-4> <triple-mouse-4> <down-mouse-5>
<mouse-5> <down-mouse-5> <mouse-5> <down-mouse-5> <mouse-5>
<double-down-mouse-5> <double-mouse-5> <down-mouse-1>
<mouse-movement> <mouse-movement> <drag-mouse-1> <down-mouse-1>
<mouse-1> <help-echo> <help-echo> <down-mouse-1> <mouse-1>
<down-mouse-5> <mouse-5> SPC ( b o u n d e d SPC t
e C-. o SPC t h e SPC s a m e SPC <help-echo> <help-echo>
<down-mouse-2> <mouse-2> SPC f u n c t i o n . D C-,
C-, C-. ) . <return> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <down-mouse-1>
<mouse-1> <help-echo> <help-echo> <down-mouse-1> <mouse-1>
* b i d C-. n d e d SPC t h e SPC t h e SPC s a m e
SPC . . . <return> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> y e s <return> <help-echo>
<help-echo> <help-echo> <help-echo> I SPC a m SPC n
o t SPC a SPC n a t i v e SPC s p e a k e r C-a s e
l l o u t : SPC C-e , SPC I SPC w i l l SPC c h e c
k SPC t h e SPC m e a n d C-. d C-. i n g SPC o f SPC
t h e C-. o s e SPC w o r d s SPC o C-. a d C-. g a
i n SPC : ) <return> I SPC h a v e SPC l a t e s t
SPC E m a c s SPC f r o m SPC n a q u a d a h SPC r
e p o s i t o r y . <return> <down-mouse-4> <mouse-4>
<help-echo> <help-echo> <down-mouse-1> <help-echo>
<drag-mouse-1> <help-echo> <help-echo> <down-mouse-1>
<mouse-1> <help-echo> <help-echo> <down-mouse-1> <mouse-1>
H-m r e p o r t <return>

Recent messages:
byte-code: Beginning of buffer [7 times]
byte-code: End of buffer [6 times]
Mark set
byte-code: Text is read-only: #<buffer #emacs> [38 times]
delete-backward-char: Text is read-only [2 times]
Undo! [3 times]
call-interactively: End of buffer
Directory has changed on disk; type g to update Dired [3 times]
byte-code: End of buffer [2 times]
byte-code: Beginning of buffer [3 times]

Load-path shadows:
/usr/share/emacs/24.2.50/site-lisp/cmake-data/cmake-mode hides
/usr/share/emacs/site-lisp/cmake-mode
/usr/share/emacs/24.2.50/site-lisp/debian-startup hides
/usr/share/emacs/site-lisp/debian-startup
/home/maciek/.emacs.d/elpa/ruby-mode-1.1/ruby-mode hides
/usr/share/emacs/24.2.50/lisp/progmodes/ruby-mode
/usr/share/emacs-snapshot/site-lisp/latex-cjk-thai/thai-word hides
/usr/share/emacs/24.2.50/lisp/language/thai-word

Features:
(shadow sort mail-extr emacsbug message rfc822 mml mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums mail-utils debug vc-git misearch
multi-isearch dired-aux mule-util network-stream starttls tls erc-menu
erc-join erc-ring erc-networks erc-pcomplete pcomplete comint ansi-color
ring erc-track erc-match erc-button wid-edit erc-fill erc-stamp
erc-netsplit erc-goodies erc erc-backend erc-compat format-spec
auth-source eieio byte-opt bytecomp byte-compile cconv gnus-util mm-util
mail-prsvr password-cache thingatpt pp startup-layout autorevert
file-options yasnippet help-mode snippets smex ido ido-mode-own
text-mode-own python-mode-own advice help-fns advice-preload
dired-details dired dired-mode-own derived find-file glsl-mode cc-mode
cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars
cc-defs cpp-mode-own latex-mode-own rvm ruby-mode-own modes movement
edmacro kmacro basic-edit-toolkit keybindings misterioso-theme paren
appearance ace-jump-mode-autoloads auctex-autoloads tex-site
coffee-mode-autoloads color-theme-autoloads dired-details-autoloads
feature-mode-autoloads haml-mode-autoloads haskell-mode-autoloads
iy-go-to-char-autoloads magit-autoloads info easymenu
python-mode-autoloads rspec-mode-autoloads mode-compile-autoloads
ruby-mode-autoloads rvm-autoloads smex-autoloads yaml-mode-autoloads
yari-autoloads yasnippet-autoloads package cl-macs gv package-manager cl
cl-lib 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)

Message #8 received at 12826 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Maciek Pacut <maciek.pacut <at> gmail.com>
Cc: 12826 <at> debbugs.gnu.org
Subject: Re: bug#12826: 24.2.50; M-x term
Date: Wed, 07 Nov 2012 23:33:59 -0500

> I binded delete-backward-char to other key than backspace and deleting
> text in M-x term doesn't work as it should.  when I write e.g.
> "aoeui" and then remove "aoeui" and type "ls" terminal tries to launch
> command "aoeuils".  This is an issue also with emacs -q and running
> command (global-set-key (kbd "C-.") 'delete-backward-char)

That's because the way to perform a "backspace" in such a terminal is to
send the DEL char to the application (e.g. `backspace' is bound to
term-send-backspace in term.el).

Not sure how term.el could better handle your situation.  I guess it
could try to prevent you from running the delete-backward-char command
(so at least you get to learn about the problem more directly).
or maybe it could remap delete-backward-char to term-send-backspace.


        Stefan

Message #13 received at 12826 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 12826 <at> debbugs.gnu.org, Maciek Pacut <maciek.pacut <at> gmail.com>
Subject: Re: bug#12826: 24.2.50; M-x term, delete-backward-char doesn't
 delete input when rebound to non-backspace key doesn't
Date: Thu, 15 Jul 2021 19:19:45 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> I binded delete-backward-char to other key than backspace and deleting
>> text in M-x term doesn't work as it should.  when I write e.g.
>> "aoeui" and then remove "aoeui" and type "ls" terminal tries to launch
>> command "aoeuils".  This is an issue also with emacs -q and running
>> command (global-set-key (kbd "C-.") 'delete-backward-char)
>
> That's because the way to perform a "backspace" in such a terminal is to
> send the DEL char to the application (e.g. `backspace' is bound to
> term-send-backspace in term.el).
>
> Not sure how term.el could better handle your situation.  I guess it
> could try to prevent you from running the delete-backward-char command
> (so at least you get to learn about the problem more directly).
> or maybe it could remap delete-backward-char to term-send-backspace.

I think this sounds like there isn't really an error here, and that this
is up to the user, so I'm closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #18 received at 12826 <at> debbugs.gnu.org (full text, mbox):

From: Phil Sainty <psainty <at> orcon.net.nz>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 12826 <at> debbugs.gnu.org, Maciek Pacut <maciek.pacut <at> gmail.com>,
 Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#12826: 24.2.50; M-x term, delete-backward-char doesn't
 delete input when rebound to non-backspace key doesn't
Date: Sat, 17 Jul 2021 03:47:22 +1200

That looks like a duplicate of bug#24837 which we resolved in 26.1.

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24837

*** 'term-char-mode' now makes its buffer read-only.
The buffer is made read-only to prevent changes from being made by
anything other than the process filter; and movements of point away
from the process mark are counter-acted so that the cursor is in the
correct position after each command.  This is needed to avoid states
which are inconsistent with the state of the terminal understood by
the inferior process.

New user options 'term-char-mode-buffer-read-only' and
'term-char-mode-point-at-process-mark' control these behaviors, and
are non-nil by default.  Customize these options to nil if you want
the previous behavior.

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