GNU bug report logs - #29430
26.0.90; C-M-backspace is undefined

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Package: emacs; Severity: wishlist; Reported by: Devon Sean McCullough <Emacs-Hacker2017@HIDDEN>; merged with #37447; dated Fri, 24 Nov 2017 19:13:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Merged 29430 37447. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#29430: 26.0.90; C-M-backspace is undefined
From: Devon Sean McCullough <Emacs-Hacker2017@HIDDEN>
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> On Nov 25, 2017, at 6:14 PM, Richard Stallman <rms@HIDDEN> wrote:
> It is not just on NextStep.
> I think I saw one of these kill X windows on GNU/Linux.

*BLUSH* I flipped a bit, here's the correct code:

(when (eq 'ns (window-system))
 ;; These were once dangerous in various situations,
 ;; so let's not encourage just anyone to use them.
 (define-key global-map [C-M-delete] 'backward-kill-sexp)
 (define-key global-map [C-M-backspace] 'backward-kill-seep))

We=E2=80=99ve all seen MS-Whatever's and X11=E2=80=99s peculiar =
responses to C-M-Del
=E2=80=94 but not in recent years =E2=80=94 however NeXTStep has always =
been immune.

		Peace
			=E2=80=94Devon

P.S. Perhaps the Emacs manual should have a stolen key chord appendix
with recipes for regaining and remapping keys under MS, NS, X11, etc., =
e.g.,

    MacOSX Apple Menu > System Preferences... > Keyboard > Keyboard > =
Modifier Keys...

has user preferences to put the <Control> keys next to the <Space> bar,
disable <CapsLock> and so on.  I even put <Rubout> left of <A>
by disabling <CapsLock> and configuring a third party app.

Gnu screen steals C-a so the -e switch deserves mention, e.g.,

    screen -e '^^^^'

sets the screen intercept character to Control-Caret
which Emacs conveniently reserves for that purpose,
Many "cloud"///////network sys admins use this a lot.





Information forwarded to bug-gnu-emacs@HIDDEN:
bug#29430; Package emacs. Full text available.

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Subject: Re: bug#29430: 26.0.90; C-M-backspace is undefined
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[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

  > (unless (eq 'ns (window-system))
  >   ;; These were once dangerous in various situations,
  >   ;; so let's not encourage just anyone to use them.
  >   (define-key global-map [C-M-delete] 'backward-kill-sexp)
  >   (define-key global-map [C-M-backspace] 'backward-kill-sexp))

It is not just on NextStep.
I think I saw one of these kill X windows on GNU/Linux.

-- 
Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)
Skype: No way! See https://stallman.org/skype.html.





Information forwarded to bug-gnu-emacs@HIDDEN:
bug#29430; Package emacs. Full text available.

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Subject: Re: bug#29430: 26.0.90; C-M-backspace is undefined
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> On Nov 24, 2017, at 2:28 PM, Noam Postavsky =
<npostavs@HIDDEN> wrote:
> Seems to be on purpose, bindings.el:1236:
> ;;; These are dangerous in various situations,
> ;;; so let's not encourage anyone to use them.
> ;;;(define-key global-map [C-M-delete] 'backward-kill-sexp)
> ;;;(define-key global-map [C-M-backspace] 'backward-kill-seep)

I doubt those historical reasons still hold
but let's be ultra-cautious =E2=80=94 here's a minimal fix:

(unless (eq 'ns (window-system))
  ;; These were once dangerous in various situations,
  ;; so let's not encourage just anyone to use them.
  (define-key global-map [C-M-delete] 'backward-kill-sexp)
  (define-key global-map [C-M-backspace] 'backward-kill-sexp))

		Peace
			--Devon

P.S. Microsoft apparently considered Ctrl+Alt+Del a security feature,
laughably assuming it would be difficult for malware to intercept it
and steal passwords with a fake login screen.

P.P.S. X11 had a misfeature where Ctrl+Alt+Del nuked all your work
which has been disabled by default for years now in most situations,
e.g.,
    =
https://access.RedHat.com/documentation/en-us/red_hat_enterprise_linux/7/h=
tml/desktop_migration_and_administration_guide/enable-ctrl-alt-backspace
    =
https://AskUbuntu.com/questions/367983/how-do-i-enable-ctrl-alt-backspace-=
to-kill-the-x-server

P.P.P.S. As much as I condemn the imperious cyber-satan at One Infinite =
Loop,
they set mostly legal and licensing booby traps, seldom technical ones.=




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bug#29430; Package emacs. Full text available.

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On Fri, Nov 24, 2017 at 2:12 PM, Devon Sean McCullough
<Emacs-Hacker2017@HIDDEN> wrote:
> C-M-DEL and ESC C-DEL should both run the same command.
>
> <C-M-backspace> is undefined
>
> ESC <C-backspace> (translated from <escape> <C-backspace>) runs the
> command backward-kill-sexp (found in global-map), which is an
> interactive compiled Lisp function in =E2=80=98lisp.el=E2=80=99.
> It is bound to ESC <C-backspace>, ESC <C-delete>.
>
>                 Peace
>                         --Devon
>
> P.S. Perhaps a missing translation?

Seems to be on purpose, bindings.el:1236:

;;; These are dangerous in various situations,
;;; so let's not encourage anyone to use them.
;;;(define-key global-map [C-M-delete] 'backward-kill-sexp)
;;;(define-key global-map [C-M-backspace] 'backward-kill-sexp)




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#29430; Package emacs. Full text available.

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Subject: 26.0.90; C-M-backspace is undefined
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C-M-DEL and ESC C-DEL should both run the same command.

<C-M-backspace> is undefined

ESC <C-backspace> (translated from <escape> <C-backspace>) runs the
command backward-kill-sexp (found in global-map), which is an
interactive compiled Lisp function in =E2=80=98lisp.el=E2=80=99.
It is bound to ESC <C-backspace>, ESC <C-delete>.

		Peace
			--Devon

P.S. Perhaps a missing translation?

M-DEL (translated from <M-backspace>) runs the command
backward-kill-word (found in global-map), which is an interactive
compiled Lisp function in =E2=80=98simple.el=E2=80=99.
It is bound to <C-backspace>, M-DEL.

In GNU Emacs 26.0.90 (build 1, x86_64-apple-darwin13.4.0, NS =
appkit-1265.21 Version 10.9.5 (Build 13F1911))
 of 2017-10-11 built on builder10-9.local
Windowing system distributor 'Apple', version 10.3.1404
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list... [2 times]
backward-kill-sexp is on ESC <C-backspace>, ESC <C-delete>
Mark set
<C-M-backspace> is undefined
kill-region: Buffer is read-only: #<buffer *GNU Emacs*> [3 times]
Configured using:
 'configure --with-ns '--enable-locallisppath=3D/Library/Application
 Support/Emacs/${version}/site-lisp:/Library/Application
 Support/Emacs/site-lisp' --with-modules'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg
epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils thingatpt elec-pair
time-date tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/ns-win ns-win ucs-normalize mule-util
term/common-win tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote kqueue cocoa ns multi-tty make-network-process emacs)

Memory information:
((conses 16 204735 11575)
 (symbols 48 20073 1)
 (miscs 40 74 193)
 (strings 32 28896 1236)
 (string-bytes 1 754349)
 (vectors 16 35060)
 (vector-slots 8 707316 10269)
 (floats 8 48 256)
 (intervals 56 230 0)
 (buffers 992 13))





Acknowledgement sent to Devon Sean McCullough <Emacs-Hacker2017@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#29430; Package emacs. Full text available.
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