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Subject: bug#60101: 29.0.60; help-quick should use C-/ for undo
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Date: Thu, 15 Dec 2022 19:21:34 +0000
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The new help-quick command makes use of `where-is-internal' to find the
binding for a command ti displays.  This works fine if a command has
only one binding, but in the case of `undo', C-_ is the first one it
suggests, since

    (mapcar #'key-description (where-is-internal 'undo))
    ;; => ("C-_" "<undo>" "C-/" "<menu-bar> <edit> <undo>")

    (key-description (where-is-internal 'undo nil t))
    ;; => "C-_"

It appears this issue can be resolved by setting

    (setq where-is-preferred-modifier 'C)

    (mapcar #'key-description (where-is-internal 'undo))
    ;; => ("C-_" "<undo>" "C-/" "<menu-bar> <edit> <undo>")

    (key-description (where-is-internal 'undo nil t))
    ;; => "C-/"

But to be honest, I don't understand why, nor do I think the solution is
particularly robust.

I think some general mechanism to associate preferred binding with keys
would be nice to have.  What I wonder is if this is general enough of a
use-case to be added to where-is-internal, or should this be fixed
inside of help-quick?

The other issue is how does one determine what binding is preferable.  I
had previously generalised that C-/ is obviously preferable, but that
differs from layout to layout and depending on what keys Emacs can even
detect (I believe C-x u is often the only key that can be used in TUI
mode).

In GNU Emacs 29.0.60 (build 5, x86_64-pc-linux-gnu, GTK+ Version
 3.24.35, cairo version 1.16.0) of 2022-12-14 built on quetzal
Repository revision: 622838b957e240d700585050e9ddbd036e690513
Repository branch: emacs-29
System Description: Debian GNU/Linux bookworm/sid

Configured using:
 'configure --with-pgtk --with-imagemagick'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES
NOTIFY INOTIFY PDUMPER PGTK PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER XIM GTK3 ZLIB

Important settings:
  value of $EMACSLOADPATH: 
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  rcirc-color-mode: t
  rcirc-track-minor-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
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  shell-dirtrack-mode: t
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  repeat-mode: t
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  display-time-mode: t
  diff-hl-flydiff-mode: t
  winner-mode: t
  windmove-mode: t
  corfu-history-mode: t
  vertico-multiform-mode: t
  vertico-mode: t
  electric-pair-mode: t
  recentf-mode: t
  save-place-mode: t
  savehist-mode: t
  pixel-scroll-precision-mode: t
  pixel-scroll-mode: t
  xterm-mouse-mode: t
  which-function-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  buffer-read-only: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/home/philip/.config/emacs/site-lisp/sbbs-pld/sbbs hides /home/philip/.config/emacs/site-lisp/sbbs/sbbs
/home/philip/.config/emacs/site-lisp/flymake-proselint/flymake-proselint hides /home/philip/.config/emacs/elpa/flymake-proselint-0.3.0/flymake-proselint
/home/philip/.config/emacs/site-lisp/writegood-mode/writegood-mode hides /home/philip/.config/emacs/elpa/writegood-mode-2.2.0/writegood-mode
/home/philip/.config/emacs/site-lisp/writegood-mode/writegood-mode-autoloads hides /home/philip/.config/emacs/elpa/writegood-mode-2.2.0/writegood-mode-autoloads
/home/philip/.config/emacs/site-lisp/writegood-mode/writegood-mode-pkg hides /home/philip/.config/emacs/elpa/writegood-mode-2.2.0/writegood-mode-pkg
/home/philip/.config/emacs/elpa/transient-0.3.7/transient hides /home/philip/Source/emacs/lisp/transient

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tree-widget saveplace savehist pixel-scroll cua-base xt-mouse
modus-operandi-theme modus-themes pcase which-func imenu cus-edit pp
cus-load icons wid-edit package browse-url url url-proxy url-privacy
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with-editor-autoloads geiser-guile-autoloads geiser-impl help-fns
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geiser-autoloads transient-autoloads magit-section-autoloads
vertico-autoloads debbugs-autoloads compat-autoloads
editorconfig-autoloads rcirc-color-autoloads orderless-autoloads
yasnippet-autoloads markdown-mode-autoloads slime-autoloads
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Memory information:
((conses 16 2434927 285156)
 (symbols 48 80808 3175)
 (strings 32 393048 106951)
 (string-bytes 1 11497968)
 (vectors 16 174618)
 (vector-slots 8 3411953 405729)
 (floats 8 3321 2460)
 (intervals 56 128930 7495)
 (buffers 984 158))

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Philip Kaludercic <philipk@HIDDEN>
Subject: bug#60101: Acknowledgement (29.0.60; help-quick should use C-/
 for undo)
Message-ID: <handler.60101.B.16711321031043.ack <at> debbugs.gnu.org>
References: <87sfhgtqv5.fsf@HIDDEN>
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Date: Thu, 15 Dec 2022 19:22:02 +0000

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Subject: bug#60101: 29.0.60; help-quick should use C-/ for undo
Resent-From: Juri Linkov <juri@HIDDEN>
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From: Juri Linkov <juri@HIDDEN>
In-Reply-To: <87sfhgtqv5.fsf@HIDDEN> (Philip Kaludercic's message of "Thu, 
 15 Dec 2022 19:21:34 +0000")
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Date: Thu, 15 Dec 2022 21:34:09 +0200
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> I think some general mechanism to associate preferred binding with keys
> would be nice to have.  What I wonder is if this is general enough of a
> use-case to be added to where-is-internal, or should this be fixed
> inside of help-quick?

In lisp/bindings.el its preferred binding is defined by this line:

  (put 'undo :advertised-binding [?\C-x ?u])

Last modified: Thu, 15 Dec 2022 19:45:02 UTC

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