GNU bug report logs - #44448
27.1; Strange inteference between timer, modeline/header-line and buffer position in window

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Amai Kinono <amaikinono <at> gmail.com>
Subject: bug#44448: closed (Re: bug#44448: Fwd: bug#44448:)
Date: Wed, 18 Aug 2021 15:48:02 +0000

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Your bug report

#44448: 27.1; Strange inteference between timer, modeline/header-line and buffer position in window

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 44448 <at> debbugs.gnu.org.

-- 
44448: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=44448
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Amai Kinono <amaikinono <at> gmail.com>
Cc: 44448-done <at> debbugs.gnu.org
Subject: Re: bug#44448: Fwd: bug#44448:
Date: Wed, 18 Aug 2021 18:47:24 +0300

> From: Amai Kinono <amaikinono <at> gmail.com>
> Date: Wed, 18 Aug 2021 22:00:57 +0800
> Cc: 44448 <at> debbugs.gnu.org
> 
> Thanks! From what I can tell, the bug is gone. I've been programming in Emacs for a while and haven't
> encountered it.

Thanks, I'm therefore closing the bug.  If you find another
occurrence, please reopen with the relevant data.

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From: Amai Kinono <amaikinono <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1; Strange inteference between timer, modeline/header-line and
 buffer position in window
Date: Thu, 5 Nov 2020 00:48:59 +0800

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When:

- 2 windows open the same file
- There's a timer dealing with modeline or header-line format

Then pressing `C-g` sometimes scrolls the buffer in this window to the
position in the other window.

Here's a recipe for reproduce:

- `$ emacs -Q`

- Eval this:
  ```
  (run-with-timer 0 0.1 (lambda () (setq mode-line-format "hi")))
  ```

- `M-x delete-other-windows` so we have only one window.

- `C-x C-f` to open a file. I use
  <https://github.com/lsof-org/lsof/blob/master/main.c> when testing,
  but any file that's long enough should work.

- `M-x split-window-horizontally`, so we have 2 windows viewing the same
  file. For some reason, splitting vertically doesn't trigger the
  problem.

- Scroll one window down to somethere.

- Hold `C-g` or press it repeatedly and quickly, then the window will go
  to the same position in file as the other window.

You can do the same with `header-line-format`, it also has the problem.
Using `run-with-idle-timer` instead seems doesn't have the problem.

See also <https://github.com/kiennq/emacs-mini-modeline/issues/45> where
I report the same problem. I believe another package that's influenced
by this is <https://github.com/purcell/mode-line-bell>.

--- Info generated by `report-emacs-bug` ---

In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.22,
cairo version 1.17.3)
 of 2020-08-29 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12009000
System Description: Manjaro Linux

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Mark set
[nil 24482 55348 93490 0.1 (closure (t) nil (setq mode-line-format "hi"))
nil nil 920000]
You can run the command ‘split-window-horizontally’ with M-x sp-h RET
Quit [22 times]
Quit
Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-wide-int
 --with-modules --with-cairo --with-harfbuzz 'CFLAGS=-march=x86-64
 -mtune=generic -O2 -pipe -fno-plt' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

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

Important settings:
  value of $LC_MONETARY: zh_CN.UTF-8
  value of $LC_NUMERIC: zh_CN.UTF-8
  value of $LC_TIME: zh_CN.UTF-8
  value of $LANG: zh_CN.utf8
  value of $XMODIFIERS: @im=fcitx
  locale-coding-system: utf-8-unix

Major mode: C/*l

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
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
format-spec rfc822 mml mml-sec password-cache epa derived epg epg-config
gnus-util rmail rmail-loaddefs text-property-search time-date subr-x seq
byte-opt gv bytecomp byte-compile cconv mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils vc-git diff-mode
easy-mmode cc-mode cc-fonts easymenu cc-guess cc-menus cc-cmds cc-styles
cc-align cc-engine cc-vars cc-defs cl-loaddefs cl-lib china-util tooltip
eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode
lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch
timer select scroll-bar mouse jit-lock font-lock syntax facemenu
font-core term/tty-colors frame minibuffer 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
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 threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 75931 7519)
 (symbols 48 8992 1)
 (strings 32 23346 1733)
 (string-bytes 1 858985)
 (vectors 16 14047)
 (vector-slots 8 224399 9036)
 (floats 8 27 38)
 (intervals 56 1440 1)
 (buffers 1000 12))

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