--- Begin Message ---
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Subject: |
29.0.50; Cursor shows up at the middle of the screen after window start is forced when vscroll is set |
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Date: |
Sat, 15 Jan 2022 11:56:23 +0800 |
Starting from 'emacs -Q', press M-< in the scratch buffer, then say M-:
and evaluate:
(progn
(set-window-vscroll nil 30 t)
(redisplay)
(set-window-start nil (point-max)))
The cursor will then display in the center of the screen, which is not
the correct position.
Thanks.
In GNU Emacs 29.0.50 (build 353, x86_64-pc-linux-gnu, GTK+ Version 3.24.30,
cairo version 1.17.4)
of 2022-01-15 built on trinity
Repository revision: 1f5f3b7e8955154c28342e63ba1216f83ff6d73d
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Fedora Linux 35 (Workstation Edition)
Configured using:
'configure --with-xwidgets --with-xinput2 --cache-file=/tmp/ccache'
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LCMS2 LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG
RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11
XDBE XIM XINPUT2 XPM XWIDGETS GTK3 ZLIB
Important settings:
value of $LANG: en_GB.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
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
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
indent-tabs-mode: t
transient-mark-mode: t
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message mailcap yank-media rmc puny
dired dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg
rfc6068 epg-config gnus-util text-property-search time-date seq gv
subr-x byte-opt 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 help-fns
radix-tree cl-print debug backtrace help-mode find-func cl-loaddefs
cl-lib iso-transl tooltip 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 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 emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice button
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 xwidget-internal dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit xinput2 x multi-tty
make-network-process emacs)
Memory information:
((conses 16 50551 13063)
(symbols 48 6108 1)
(strings 32 19557 2143)
(string-bytes 1 627975)
(vectors 16 12628)
(vector-slots 8 171084 17171)
(floats 8 21 54)
(intervals 56 214 2)
(buffers 992 12))
--- End Message ---
--- Begin Message ---
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Subject: |
Re: bug#53275: 29.0.50; Cursor shows up at the middle of the screen after window start is forced when vscroll is set |
|
Date: |
Sun, 16 Jan 2022 08:30:28 +0800 |
|
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.60 (gnu/linux) |
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Po Lu <luangruo@yahoo.com>
>> Cc: 53275@debbugs.gnu.org
>> Date: Sat, 15 Jan 2022 15:52:50 +0800
>>
>> Eli Zaretskii <eliz@gnu.org> writes:
>>
>> >> (progn
>> >> (set-window-vscroll nil 30 t)
>> >> (redisplay)
>> >> (set-window-start nil (point-max)))
>>
>> > Sorry, I missed the "M-<" part. With it, the behavior is
>> > reproducible, but I'm not sure I understand what is "the correct
>> > position" of the cursor in this case
>>
>> It should show up where point is, which in this case is at the window
>> start.
>>
>> > or why does it matter what Emacs does in that case (except that it
>> > should not crash).
>>
>> Precision scrolling relies on this: when the buffer cannot be scrolled
>> downwards sufficiently, it sets the window start to point-max and
>> redisplays, which right now results in the cursor being displayed in the
>> middle of the screen until the next redisplay.
>
> Should be fixed now on the master branch.
Indeed, I'm closing this bug. Many thanks!
--- End Message ---