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* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
@ 2024-11-09 16:04 Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
  2024-11-14  8:44 ` Eli Zaretskii
  0 siblings, 1 reply; 7+ messages in thread
From: Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2024-11-09 16:04 UTC (permalink / raw)
  To: 74281


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1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in
the file with C-n, C-f or mouse scrolling. It sverely lags for several
seconds, doesn’t even respond to C-g.

2. Toggle font-lock-mode off through M-x, then try to scroll. It works
as expected, no serious lags.

3. Running the profiler also shows font-lock as the culprit.

This makes working on big projects, in my case the source code of GNU
Guix distribution an impossible situation. I haven’t tried setting up
(Guile) Scheme with Tree-Sitter, but shouldn’t simple
syntax-highlighting be not a serious problem?

To try a big Scheme file and reproduce this, open tex.scm in
gnu/packages/tex.scm in Guix source tree:

https://git.savannah.gnu.org/cgit/guix.git


In GNU Emacs 30.0.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.41, cairo version 1.18.0)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101012
System Description: Guix System

Configured using:
 'configure
 CONFIG_SHELL=/gnu/store/3jhfhxdf6v5ms10x5zmnl166dh3yhbr1-bash-minimal-5.1.16/bin/bash
 SHELL=/gnu/store/3jhfhxdf6v5ms10x5zmnl166dh3yhbr1-bash-minimal-5.1.16/bin/bash
 --prefix=/gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b
 --enable-fast-install --with-cairo --with-modules
 --with-native-compilation=aot --disable-build-details'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP
NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
  value of $EMACSLOADPATH: /home/divya/.config/guix/current/share/emacs/site-lisp:/home/divya/.guix-home/profile/share/emacs/site-lisp:/home/divya/.guix-profile/share/emacs/site-lisp:/run/current-system/profile/share/emacs/site-lisp:/gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b/share/emacs/30.0.91/lisp
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: Dired/name 452/587

Minor modes in effect:
  all-the-icons-dired-mode: t
  erc-notify-mode: t
  erc-notifications-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-ring-mode: t
  erc-netsplit-mode: t
  erc-menu-mode: t
  erc-match-mode: t
  erc-list-mode: t
  erc-irccontrols-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  erc-imenu-mode: t
  erc-pcomplete-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-autojoin-mode: t
  erc-networks-mode: t
  gcmh-mode: t
  global-corfu-mode: t
  corfu-mode: t
  global-paren-face-mode: t
  global-color-identifiers-mode: t
  global-hi-lock-mode: t
  hi-lock-mode: t
  timeclock-mode-line-display: t
  server-mode: t
  dirvish-peek-mode: t
  dirvish-side-follow-mode: t
  dirvish-override-dired-mode: t
  dired-hide-details-mode: t
  consult-org-roam-mode: t
  org-roam-db-autosync-mode: t
  winner-mode: t
  popper-mode: t
  meow-global-mode: t
  meow-mode: t
  meow-motion-mode: t
  meow-esc-mode: t
  display-time-mode: t
  dimmer-mode: t
  all-the-icons-completion-mode: t
  marginalia-mode: t
  vertico-mode: t
  global-writeroom-mode: t
  which-key-mode: t
  smartparens-global-mode: t
  doom-modeline-mode: t
  global-auto-revert-mode: t
  save-place-mode: t
  savehist-mode: t
  recentf-mode: t
  global-hl-line-mode: t
  global-display-line-numbers-mode: t
  override-global-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-quote-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-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:
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/home/divya/.emacs.d/straight/build/org/ob-awk hides /gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b/share/emacs/30.0.91/lisp/org/ob-awk
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/home/divya/.emacs.d/straight/build/soap-client/soap-client hides /gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b/share/emacs/30.0.91/lisp/net/soap-client
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/home/divya/.emacs.d/straight/build/let-alist/let-alist hides /gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b/share/emacs/30.0.91/lisp/emacs-lisp/let-alist
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Features:
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iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook
vc-hooks lisp-float-type elisp-mode mwheel term/x-win x-win
term/common-win x-dnd touch-screen tool-bar dnd fontset image regexp-opt
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register page tab-bar menu-bar rfn-eshadow isearch easymenu timer select
scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors
frame minibuffer nadvice seq simple cl-generic indonesian philippine
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 emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp
files window text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget keymap hashtable-print-readable backquote
threads dbusbind inotify lcms2 dynamic-setting system-font-setting
font-render-setting cairo gtk x-toolkit xinput2 x multi-tty move-toolbar
make-network-process native-compile emacs)

Memory information:
((conses 16 1569808 2032077) (symbols 48 77987 11)
 (strings 32 393425 106016) (string-bytes 1 17866520)
 (vectors 16 167276) (vector-slots 8 2824657 579009)
 (floats 8 2970 25080) (intervals 56 20041 6581) (buffers 992 63))

-- 
Divya Ranjan,
Philosophy, Mathematics, Libre Software.







^ permalink raw reply	[flat|nested] 7+ messages in thread

* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
  2024-11-09 16:04 bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2024-11-14  8:44 ` Eli Zaretskii
  2024-11-14  9:32   ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
  2024-11-14 16:56   ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
  0 siblings, 2 replies; 7+ messages in thread
From: Eli Zaretskii @ 2024-11-14  8:44 UTC (permalink / raw)
  To: Divya Ranjan, Stefan Monnier; +Cc: 74281

> Date: Sat, 09 Nov 2024 16:04:13 +0000
> From:  Divya Ranjan via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> 
> 1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in
> the file with C-n, C-f or mouse scrolling. It sverely lags for several
> seconds, doesn’t even respond to C-g.

I can only reproduce this with C-p when moving from the end of the
file.  C-n and C-f are instantaneous here, even though this is an
unoptimized build of Emacs 30.

> 2. Toggle font-lock-mode off through M-x, then try to scroll. It works
> as expected, no serious lags.
> 
> 3. Running the profiler also shows font-lock as the culprit.

The profile I measured is below.  It seems like the bottleneck is
parse-partial-sexp, which means the syntax table
scheme-mode-syntax-table might be the immediate suspect.

> This makes working on big projects, in my case the source code of GNU
> Guix distribution an impossible situation. I haven’t tried setting up
> (Guile) Scheme with Tree-Sitter, but shouldn’t simple
> syntax-highlighting be not a serious problem?
> 
> To try a big Scheme file and reproduce this, open tex.scm in
> gnu/packages/tex.scm in Guix source tree:
> 
> https://git.savannah.gnu.org/cgit/guix.git

Stefan, what tools do we have to investigate slowness related to
parse-partial-sexp?  Or maybe you have suggestions for how to speed up
font-lock in this case?

Here's the profile I get while moving with C-p through the above file:

        1151  66% - ...
        1151  66%  - command-execute
        1151  66%   - call-interactively
        1151  66%    - funcall-interactively
        1151  66%     - previous-line
        1151  66%      - line-move
         798  45%       - line-pixel-height
         798  45%        - jit-lock-function
         798  45%         - jit-lock-fontify-now
         798  45%          - jit-lock--run-functions
         798  45%           - run-hook-wrapped
         798  45%            - #<byte-code-function CEC>
         798  45%             - font-lock-fontify-region
         798  45%              - font-lock-default-fontify-region
         798  45%               - font-lock-fontify-syntactically-region
         798  45%                - font-lock-default-fontify-syntactically
         798  45%                   parse-partial-sexp
         353  20%       - line-move-visual
         353  20%        - vertical-motion
         353  20%         - jit-lock-function
         353  20%          - jit-lock-fontify-now
         353  20%           - jit-lock--run-functions
         353  20%            - run-hook-wrapped
         353  20%             - #<byte-code-function BCE>
         353  20%              - font-lock-fontify-region
         353  20%               - font-lock-default-fontify-region
         353  20%                - font-lock-fontify-syntactically-region
         353  20%                 - font-lock-default-fontify-syntactically
         353  20%                    parse-partial-sexp
         585  33% - redisplay_internal (C function)
         577  33%  - jit-lock-function
         577  33%   - jit-lock-fontify-now
         577  33%    - jit-lock--run-functions
         577  33%     - run-hook-wrapped
         577  33%      - #<byte-code-function 5A0>
         577  33%       - font-lock-fontify-region
         577  33%        - font-lock-default-fontify-region
         577  33%         - font-lock-fontify-syntactically-region
         577  33%          - font-lock-default-fontify-syntactically
         577  33%             parse-partial-sexp
           6   0%   Automatic GC





^ permalink raw reply	[flat|nested] 7+ messages in thread

* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
  2024-11-14  8:44 ` Eli Zaretskii
@ 2024-11-14  9:32   ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
  2024-11-14 10:06     ` Eli Zaretskii
  2024-11-14 16:56   ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
  1 sibling, 1 reply; 7+ messages in thread
From: Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2024-11-14  9:32 UTC (permalink / raw)
  To: Eli Zaretskii; +Cc: Stefan Monnier, 74281

Hello, Eli

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Sat, 09 Nov 2024 16:04:13 +0000
>> From:  Divya Ranjan via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>> 
>> 
>> 1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in
>> the file with C-n, C-f or mouse scrolling. It sverely lags for several
>> seconds, doesn’t even respond to C-g.
>
> I can only reproduce this with C-p when moving from the end of the
> file.  C-n and C-f are instantaneous here, even though this is an
> unoptimized build of Emacs 30.

I see, well its the latest build of emacs on GNU Guix, so yeah. Which lacking features in particular do you think might be causing this?

Regards,
-- 
Divya Ranjan,
Philosophy, Mathematics, Libre Software.





^ permalink raw reply	[flat|nested] 7+ messages in thread

* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
  2024-11-14  9:32   ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2024-11-14 10:06     ` Eli Zaretskii
  2024-11-14 11:09       ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
  0 siblings, 1 reply; 7+ messages in thread
From: Eli Zaretskii @ 2024-11-14 10:06 UTC (permalink / raw)
  To: Divya Ranjan; +Cc: monnier, 74281

> From: Divya Ranjan <divya@subvertising.org>
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,  74281@debbugs.gnu.org
> Date: Thu, 14 Nov 2024 09:32:12 +0000
> 
> Hello, Eli
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Date: Sat, 09 Nov 2024 16:04:13 +0000
> >> From:  Divya Ranjan via "Bug reports for GNU Emacs,
> >>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> >> 
> >> 
> >> 1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in
> >> the file with C-n, C-f or mouse scrolling. It sverely lags for several
> >> seconds, doesn’t even respond to C-g.
> >
> > I can only reproduce this with C-p when moving from the end of the
> > file.  C-n and C-f are instantaneous here, even though this is an
> > unoptimized build of Emacs 30.
> 
> I see, well its the latest build of emacs on GNU Guix, so yeah. Which lacking features in particular do you think might be causing this?

I don't understand the question: I thought I pointed at the possible
cause by mentioning syntax-directed font lock?





^ permalink raw reply	[flat|nested] 7+ messages in thread

* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
  2024-11-14 10:06     ` Eli Zaretskii
@ 2024-11-14 11:09       ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
  2024-11-14 11:42         ` Eli Zaretskii
  0 siblings, 1 reply; 7+ messages in thread
From: Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2024-11-14 11:09 UTC (permalink / raw)
  To: 74281, eliz; +Cc: monnier

[-- Attachment #1: Type: text/plain, Size: 1437 bytes --]

> I don't understand the question: I thought I pointed at the possible cause by mentioning syntax-directed font lock?

I meant you said the emacs build is "unoptimized", what can be optimized?

Regards,


On 14 November 2024 10:06:41 GMT, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Divya Ranjan <divya@subvertising.org>
>> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,  74281@debbugs.gnu.org
>> Date: Thu, 14 Nov 2024 09:32:12 +0000
>> 
>> Hello, Eli
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> >> Date: Sat, 09 Nov 2024 16:04:13 +0000
>> >> From:  Divya Ranjan via "Bug reports for GNU Emacs,
>> >>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>> >> 
>> >> 
>> >> 1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in
>> >> the file with C-n, C-f or mouse scrolling. It sverely lags for several
>> >> seconds, doesn’t even respond to C-g.
>> >
>> > I can only reproduce this with C-p when moving from the end of the
>> > file.  C-n and C-f are instantaneous here, even though this is an
>> > unoptimized build of Emacs 30.
>> 
>> I see, well its the latest build of emacs on GNU Guix, so yeah. Which lacking features in particular do you think might be causing this?
>
>I don't understand the question: I thought I pointed at the possible
>cause by mentioning syntax-directed font lock?
>
>
>

Divya Ranjan, Mathematics, Philosophy and Libre Software

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^ permalink raw reply	[flat|nested] 7+ messages in thread

* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
  2024-11-14 11:09       ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2024-11-14 11:42         ` Eli Zaretskii
  0 siblings, 0 replies; 7+ messages in thread
From: Eli Zaretskii @ 2024-11-14 11:42 UTC (permalink / raw)
  To: Divya Ranjan; +Cc: monnier, 74281

> Date: Thu, 14 Nov 2024 11:09:41 +0000
> From: Divya Ranjan <divya@subvertising.org>
> CC: monnier@iro.umontreal.ca, 74281@debbugs.gnu.org
> 
> > I don't understand the question: I thought I pointed at the possible cause by mentioning syntax-directed
> font lock?
> 
> I meant you said the emacs build is "unoptimized", what can be optimized?

No, it means the C files were compiled with -O0, which disables
compiler optimizations, so my Emacs is supposed to be slower than
normal.  And yet I seed no lags with C-n, unlike what you report.





^ permalink raw reply	[flat|nested] 7+ messages in thread

* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
  2024-11-14  8:44 ` Eli Zaretskii
  2024-11-14  9:32   ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2024-11-14 16:56   ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
  1 sibling, 0 replies; 7+ messages in thread
From: Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2024-11-14 16:56 UTC (permalink / raw)
  To: Eli Zaretskii; +Cc: Divya Ranjan, 74281

> Stefan, what tools do we have to investigate slowness related to
> parse-partial-sexp?  Or maybe you have suggestions for how to speed up
> font-lock in this case?

Hmm... `parse-partial-sexp` is normally expected to be fast, unless it
has to scan a lot of text.

> Here's the profile I get while moving with C-p through the above file:

A stab in the dark, but maybe the relevant call is the one in:

          (state (if (or syntax-ppss-table
                         (not font-lock--syntax-table-affects-ppss))
                     (syntax-ppss start)
                   ;; If `syntax-ppss' doesn't have its own syntax-table and
                   ;; we have installed our own syntax-table which
                   ;; differs from the standard one in ways which affects PPSS,
                   ;; then we can't use `syntax-ppss' since that would pollute
                   ;; and be polluted by its cache.
                   (parse-partial-sexp (point-min) start)))

so the origin of the slowdown would be the (?#. "w 14") in the setting
below in `scheme.el`:

  (setq font-lock-defaults
        '((scheme-font-lock-keywords
           scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
          nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
          beginning-of-defun
          (font-lock-mark-block-function . mark-defun)))

in which case, setting a `syntax-ppss-table` should fix the problem, tho
we could also fix it by being more careful: AFAICT the purpose of this
(?#. "w 14") is only to change the syntax of `#` from "prefix" to "word"
without changing the comment-related flags, so it shouldn't cause
`font-lock--syntax-table-affects-ppss` to be set.
So, we could solve it by improving the code that sets
`font-lock--syntax-table-affects-ppss`, as in the patch below.


        Stefan


diff --git a/lisp/font-lock.el b/lisp/font-lock.el
index 203131bfd5a..f6299920c0a 100644
--- a/lisp/font-lock.el
+++ b/lisp/font-lock.el
@@ -1955,14 +1955,15 @@ font-lock-set-defaults
 	    (dolist (char (if (numberp (car selem))
 			      (list (car selem))
 			    (mapcar #'identity (car selem))))
-	      (unless (memq (car (aref font-lock-syntax-table char))
-	                    '(1 2 3))    ;"." "w" "_"
-	        (setq font-lock--syntax-table-affects-ppss t))
-	      (modify-syntax-entry char syntax font-lock-syntax-table)
-	      (unless (memq (car (aref font-lock-syntax-table char))
-	                    '(1 2 3))    ;"." "w" "_"
-	        (setq font-lock--syntax-table-affects-ppss t))
-	      ))))
+	      (let ((old-syntax (aref font-lock-syntax-table char)))
+	        (modify-syntax-entry char syntax font-lock-syntax-table)
+	        (let ((new-syntax (aref font-lock-syntax-table char)))
+	          (unless (and (equal (cdr old-syntax) (cdr new-syntax))
+	                       (memq (logand (car old-syntax) 255) '(1 2 3 6))
+	                       (memq (logand (car new-syntax) 255) '(1 2 3 6))
+	                       (equal (ash (car old-syntax) -8)
+	                              (ash (car new-syntax) -8)))
+	            (setq font-lock--syntax-table-affects-ppss t))))))))
       ;; (nth 4 defaults) used to hold `font-lock-beginning-of-syntax-function',
       ;; but that was removed in 25.1, so if it's a cons cell, we assume that
       ;; it's part of the variable alist.






^ permalink raw reply related	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2024-11-14 16:56 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-11-09 16:04 bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-14  8:44 ` Eli Zaretskii
2024-11-14  9:32   ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-14 10:06     ` Eli Zaretskii
2024-11-14 11:09       ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-14 11:42         ` Eli Zaretskii
2024-11-14 16:56   ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors

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