bug#70966: 30.0.50; eshell/diff produces track-changes errors

bug#70966: 30.0.50; eshell/diff produces track-changes errors

[Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Steps to reproduce:

1. Start `emacs -Q`.
2. Open `M-x eshell RET`.
3. Run `diff a b` (calls `eshell/diff`). The files `a` and `b` don't
have to exist.

This results in warnings buffer complaining about:

    Warning (emacs): Missing/incorrect calls to ‘before/after-change-functions’!!

Where the logged `track-changes--error-log` is:

    (("*Diff*"
      ((t track-changes--recover-from-error nil nil)
       (t track-changes-fetch
          (#1=
           #s(track-changes--tracker :signal diff--track-changes-signal
    				 :state
    				 #s(track-changes--state :beg 174 :end
    							 1 :before nil
    							 :next nil)
    				 :nobefore t :immediate nil)
           diff--track-changes-function)
          nil)
       (t diff--track-changes-signal (#1#) nil)
       (t track-changes--call-signal (#<buffer *Diff*> #1#) nil)
       (t apply (track-changes--call-signal #2=(#<buffer *Diff*> #1#)) nil)
       (t timer-event-handler
          ([t 26180 63752 401543 nil track-changes--call-signal #2# nil
    	  112000 nil])
          nil))
      [return (nil . minibuffer-complete-and-exit) 100
    	  (nil . self-insert-command) 105 (nil . self-insert-command)
    	  102 (nil . self-insert-command) 102
    	  (nil . self-insert-command) 32 (nil . self-insert-command)
    	  97 (nil . self-insert-command) 32
    	  (nil . self-insert-command) 98 (nil . self-insert-command)
    	  return (nil . eshell-send-input)]))

In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, cairo version
 1.18.0) of 2024-05-13 built on Laptop
Repository revision: e86c4d8bdc8bdbc959a1f7f03576205ce707743e
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101013
System Description: Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
 --with-modules --without-m17n-flt --without-selinux --without-pop
 --without-gconf --enable-link-time-optimization
 --with-native-compilation=yes --with-xinput2 --with-x-toolkit=no
 --without-toolkit-scroll-bars --without-xft --without-xaw3d
 --with-cairo-xcb --with-sound=no --with-tree-sitter --without-gpm
 --without-compress-install
 '--program-transform-name=s/\([ec]tags\)/\1.emacs/'
 'CFLAGS=-march=native -mtune=native -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security
 -fstack-clash-protection -fcf-protection -flto=auto' 'LDFLAGS=-Wl,-O1
 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now
 -Wl,-z,pack-relative-relocs -Wl,-z,noexecstack -flto=auto''

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

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

Major mode: Messages

Minor modes in effect:
  windmove-mode: t
  global-atomic-chrome-edit-mode: t
  i3bar-mode: t
  ednc-mode: t
  auto-compile-on-load-mode: t
  auto-compile-on-save-mode: t
  save-place-mode: t
  savehist-mode: t
  openwith-mode: t
  global-org-modern-mode: t
  eat-eshell-mode: t
  magit-todos-mode: t
  global-git-commit-mode: t
  dired-async-mode: t
  magit-auto-revert-mode: t
  server-mode: t
  recentf-mode: t
  global-treesit-auto-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  async-bytecomp-package-mode: t
  sudo-edit-indicator-mode: t
  global-auto-revert-mode: t
  vertico-mode: t
  corfu-popupinfo-mode: t
  global-corfu-mode: t
  corfu-mode: t
  isearch-mb-mode: t
  pixel-scroll-precision-mode: t
  global-hl-todo-mode: t
  all-the-icons-completion-mode: t
  marginalia-mode: t
  global-page-break-lines-mode: t
  global-anzu-mode: t
  anzu-mode: t
  global-jinx-mode: t
  evil-goggles-mode: t
  global-evil-surround-mode: t
  evil-surround-mode: t
  global-evil-collection-unimpaired-mode: t
  evil-collection-unimpaired-mode: t
  evil-mode: t
  evil-local-mode: t
  desktop-environment-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-history-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  window-divider-mode: t
  minibuffer-regexp-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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/home/steb/.cache/emacs/elpa/org-9.6.30/ob-lob hides /usr/share/emacs/30.0.50/lisp/org/ob-lob
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/home/steb/.cache/emacs/elpa/org-9.6.30/ob-lilypond hides /usr/share/emacs/30.0.50/lisp/org/ob-lilypond
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/home/steb/.cache/emacs/elpa/org-9.6.30/ob-eshell hides /usr/share/emacs/30.0.50/lisp/org/ob-eshell
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/home/steb/.cache/emacs/elpa/org-9.6.30/ob-dot hides /usr/share/emacs/30.0.50/lisp/org/ob-dot
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dynamic-setting system-font-setting font-render-setting cairo xinput2 x
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Memory information:
((conses 16 1645733 1485415) (symbols 48 72957 92) (strings 32 431689 100984)
 (string-bytes 1 13716396) (vectors 16 183931) (vector-slots 8 3020585 794696) (floats 8 845 8461)
 (intervals 56 25012 14577) (buffers 992 52))

bug#70966: 30.0.50; eshell/diff produces track-changes errors

[Eli Zaretskii]

> Date: Wed, 15 May 2024 11:05:02 -0700
> From:  Steven Allen via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> 
> Steps to reproduce:
> 
> 1. Start `emacs -Q`.
> 2. Open `M-x eshell RET`.
> 3. Run `diff a b` (calls `eshell/diff`). The files `a` and `b` don't
> have to exist.
> 
> This results in warnings buffer complaining about:
> 
>     Warning (emacs): Missing/incorrect calls to ‘before/after-change-functions’!!
> 
> Where the logged `track-changes--error-log` is:
> 
>     (("*Diff*"
>       ((t track-changes--recover-from-error nil nil)
>        (t track-changes-fetch
>           (#1=
>            #s(track-changes--tracker :signal diff--track-changes-signal
>     				 :state
>     				 #s(track-changes--state :beg 174 :end
>     							 1 :before nil
>     							 :next nil)
>     				 :nobefore t :immediate nil)
>            diff--track-changes-function)
>           nil)
>        (t diff--track-changes-signal (#1#) nil)
>        (t track-changes--call-signal (#<buffer *Diff*> #1#) nil)
>        (t apply (track-changes--call-signal #2=(#<buffer *Diff*> #1#)) nil)
>        (t timer-event-handler
>           ([t 26180 63752 401543 nil track-changes--call-signal #2# nil
>     	  112000 nil])
>           nil))
>       [return (nil . minibuffer-complete-and-exit) 100
>     	  (nil . self-insert-command) 105 (nil . self-insert-command)
>     	  102 (nil . self-insert-command) 102
>     	  (nil . self-insert-command) 32 (nil . self-insert-command)
>     	  97 (nil . self-insert-command) 32
>     	  (nil . self-insert-command) 98 (nil . self-insert-command)
>     	  return (nil . eshell-send-input)]))

Thanks, I'm adding Stefan to this discussion.

bug#70966: 30.0.50; eshell/diff produces track-changes errors

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

[-- Attachment #1: Type: text/plain, Size: 183 bytes --]

The patch below seems to fix this problem.

John, do you remember why you had those let-bindings (which originally
were let-binding `after-change-functions` to nil)?


        Stefan

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: eshell.patch --]
[-- Type: text/x-diff, Size: 963 bytes --]

diff --git a/lisp/eshell/esh-mode.el b/lisp/eshell/esh-mode.el
index 78a448a41a5..8e993d47183 100644
--- a/lisp/eshell/esh-mode.el
+++ b/lisp/eshell/esh-mode.el
@@ -623,7 +623,8 @@ eshell-send-input
   ;; Note that the input string does not include its terminal newline.
   (let* ((proc-running-p (eshell-head-process))
          (send-to-process-p (and proc-running-p (not queue-p)))
-         (inhibit-modification-hooks t))
+         ;; (inhibit-modification-hooks t)
+         )
     (unless (and send-to-process-p
 		 (not (eq (process-status
 			   (eshell-head-process))
@@ -710,7 +711,8 @@ eshell-interactive-filter
   (unless buffer
     (setq buffer (current-buffer)))
   (when (and string (buffer-live-p buffer))
-    (let ((inhibit-modification-hooks t))
+    (let (;; (inhibit-modification-hooks t)
+          )
       (with-current-buffer buffer
         (let ((functions eshell-preoutput-filter-functions))
           (while (and functions string)

bug#70966: 30.0.50; eshell/diff produces track-changes errors

[John Wiegley]

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

> The patch below seems to fix this problem.
>
> John, do you remember why you had those let-bindings (which originally
> were let-binding `after-change-functions` to nil)?

No, I don’t remember at all, but I imagine the reason will be re-discovered…

-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2

bug#70966: 30.0.50; eshell/diff produces track-changes errors

[Eli Zaretskii]

Ping!  How should we go about resolving this issue?

> From: John Wiegley <johnw@gnu.org>
> Date: Thu, 16 May 2024 09:15:24 -0700
> Cc: Eli Zaretskii <eliz@gnu.org>, Steven Allen <steven@stebalien.com>,
>  70966@debbugs.gnu.org
> 
> >>>>> Stefan Monnier <monnier@iro.umontreal.ca> writes:
> 
> > The patch below seems to fix this problem.
> >
> > John, do you remember why you had those let-bindings (which originally
> > were let-binding `after-change-functions` to nil)?
> 
> No, I don’t remember at all, but I imagine the reason will be re-discovered…
> 
> -- 
> John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
> http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2
> 
> 
> 
> 

bug#70966: 30.0.50; eshell/diff produces track-changes errors

[John Wiegley]

>>>>> Eli Zaretskii <eliz@gnu.org> writes:

> Ping!  How should we go about resolving this issue?

Sadly, I no longer have the original Git history for Eshell, and these lines
were present when it was brought into Emacs core. I think the only thing you
can assume is that I made a mistake and the fix presented here is the correct
one, and then perhaps it may become manifest later why I made that decision
long ago.

-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2

bug#70966: 30.0.50; eshell/diff produces track-changes errors

[Eli Zaretskii]

> From: John Wiegley <johnw@gnu.org>
> Cc: monnier@iro.umontreal.ca,  steven@stebalien.com,  70966@debbugs.gnu.org
> Date: Sat, 25 May 2024 23:25:47 -0700
> 
> >>>>> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Ping!  How should we go about resolving this issue?
> 
> Sadly, I no longer have the original Git history for Eshell, and these lines
> were present when it was brought into Emacs core. I think the only thing you
> can assume is that I made a mistake and the fix presented here is the correct
> one, and then perhaps it may become manifest later why I made that decision
> long ago.

OK, thanks.

Stefan, please feel free to install your patch, and thanks.

bug#70966: 30.0.50; eshell/diff produces track-changes errors

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

> Stefan, please feel free to install your patch, and thanks.

Thanks, pushed, closing,


        Stefan

bug#70966: 30.0.50; eshell/diff produces track-changes errors

[Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Thanks! All fixed for me.