From: Geza Herman <geza.herman@gmail.com>
To: 66764@debbugs.gnu.org
Subject: bug#66764: 29.1; Emacs scrolls for "(goto-char (point-max))" instead of jumping
Date: Thu, 26 Oct 2023 19:04:42 +0200 [thread overview]
Message-ID: <ddf1fc8b-2e31-4b2e-8da6-845031ac4171@gmail.com> (raw)
The bug is, that in certain circumstances, emacs moves the point by
using some kind of scrolling for "(goto-char (point-max))", instead of
just jumping.
Repro:
- create a file using the little C program at the end (it produces a
large text to stdout, you'll need to redirect it to some file)
- open the file with "emacs -Q generated.txt"
- with M-:, execute this:
(progn
(setq scroll-conservatively 101)
(font-lock-add-keywords nil '(((lambda (bound)) (1 'error prepend
t))) t)
(goto-char (point-max)))
Notice that emacs doesn't jump to the end immediately as usual, but it
does some kind of very fast scrolling.
(With long-line-threshold set to nil, the issue doesn't happen)
In my real case, a much smaller file produces this problem. Also, Emacs
doesn't go to the end of the file, but stops somewhere in the middle (I
was unable to reproduce this issue with a simple configuration). So to
go to the end of the file I have to run "(goto-char (point-max))"
multiple times. Interestingly, "M->" works fine. But if I remove the
recenter call at the end of "end-of-buffer", it also has this odd behavior.
Here is the C program:
#include <stdio.h>
#include <stdlib.h>
int main() {
for (int i=0; i<200000; i++) {
int len = 100 + (rand()&0x7f);
if (i==5000) len = 60000;
for (int j=0; j<len; j++) {
printf("x");
}
printf("\n");
}
}
In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38,
cairo version 1.16.0) of 2023-08-30, modified by Debian built on
x86-csail-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12101008
System Description: Debian GNU/Linux trixie/sid
Configured using:
'configure --build x86_64-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/libexec
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --with-libsystemd --with-pop=yes
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/29.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/29.1/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-mailutils
--with-native-compilation --build x86_64-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/libexec
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --with-libsystemd --with-pop=yes
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/29.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/29.1/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-mailutils
--with-native-compilation --with-cairo --with-x=yes
--with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2
-ffile-prefix-map=/build/reproducible-path/emacs-29.1+1=.
-fstack-protector-strong
-Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
-D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON 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 WEBP X11 XDBE XIM XINPUT2
XPM GTK3 ZLIB
Important settings:
value of $LC_ALL: C.UTF-8
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: Text
Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
show-paren-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
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:
None found.
Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils comp comp-cstr
warnings icons subr-x rx cl-seq cl-macs gv cl-extra help-mode
cl-loaddefs cl-lib bytecomp byte-compile rmc 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 tool-bar dnd
fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode lisp-mode prog-mode 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
move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
native-compile emacs)
Memory information:
((conses 16 100665 12371)
(symbols 48 7141 0)
(strings 32 26857 2252)
(string-bytes 1 845777)
(vectors 16 20215)
(vector-slots 8 367701 18494)
(floats 8 50 17)
(intervals 56 2211 0)
(buffers 984 12))
next reply other threads:[~2023-10-26 17:04 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-26 17:04 Geza Herman [this message]
2023-10-26 18:25 ` bug#66764: 29.1; Emacs scrolls for "(goto-char (point-max))" instead of jumping Eli Zaretskii
2023-10-26 19:12 ` Herman, Géza
2023-10-27 5:46 ` Eli Zaretskii
2023-10-27 6:50 ` Eli Zaretskii
2023-10-27 9:43 ` Herman, Géza
2023-11-04 8:29 ` Eli Zaretskii
2023-11-18 9:01 ` Eli Zaretskii
2023-11-25 11:37 ` Gregory Heytings
2023-12-09 13:33 ` Eli Zaretskii
2023-12-23 8:37 ` Eli Zaretskii
2023-12-28 10:53 ` Gregory Heytings
2024-01-09 20:01 ` Eli Zaretskii
2024-01-11 23:40 ` Gregory Heytings
2024-01-13 19:11 ` Eli Zaretskii
2024-01-14 19:36 ` Eli Zaretskii
2024-01-14 22:06 ` Gregory Heytings
2024-01-15 12:22 ` Eli Zaretskii
2024-01-15 13:30 ` Gregory Heytings
2024-01-13 19:10 ` Eli Zaretskii
2024-01-13 19:13 ` Eli Zaretskii
2023-10-27 9:22 ` Herman, Géza
2023-10-27 10:43 ` Eli Zaretskii
2023-10-28 1:15 ` Geza Herman
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