Package: emacs;
Reported by: Steven Allen <steven <at> stebalien.com>
Date: Sat, 27 Jul 2024 17:59:02 UTC
Severity: normal
Found in version 31.0.50
Done: Stefan Kangas <stefankangas <at> gmail.com>
Bug is archived. No further changes may be made.
View this message in rfc822 format
From: Steven Allen <steven <at> stebalien.com> To: 72323 <at> debbugs.gnu.org Cc: "Kim F. Storm" <storm <at> cua.dk> Subject: bug#72323: 31.0.50; line-move unconditionally resets vscroll to 0 Date: Sat, 27 Jul 2024 10:57:44 -0700
Per the title, `line-move' unconditionally sets vscroll to 0:
(set-window-vscroll nil 0 t)
Unfortunately, this causes several issues when using
`pixel-scroll-precision-mode':
1. Moving the cursor up/down, to the beginning of the line, or to the
end of the line resets vscroll causing the entire window to "jump".
2. It breaks `pixel-scroll-precision-mode' in Evil because
`evil-adjust-cursor' calls `move-end-of-line' internally. Whenever the
cursor is in a blank line, scrolling "sticks" unless you scroll fast
enough to scroll more than a partial line.
I'm submitting a patch to Evil to work around the second issue, but
having the entire window jump whenever I first move the cursor
up/down/end/home immediately after scrolling is still a bit annoying.
Fixing home/end (beginning of line, end of line) case seems trivial:
don't call `line-move' in these cases (or have `line-move' short-circuit
when `arg' is 0). However, even after reading all the comments about
scrolling images, I'm still not sure why it's necessary to reset vscroll
to 0. After commenting this line out, I can't tell a difference, even
when scrolling images with and without `auto-window-vscroll' and
`try-vscroll'. I was hoping Kim could shed some light on this.
In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, cairo version
1.18.0) of 2024-07-24 built on Laptop
Repository revision: 2f5af5cab3869af426631735f12acf30798136bf
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
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'--program-transform-name=s/\([ec]tags\)/\1.emacs/'
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-Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now
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Configured features:
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LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY OLDXMENU PDUMPER
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Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: notmuch-show
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/home/steb/.cache/emacs/elpa/notmuch-20240725.1037/notmuch-address hides /usr/share/emacs/site-lisp/notmuch-address
/home/steb/.cache/emacs/elpa/notmuch-20240725.1037/coolj hides /usr/share/emacs/site-lisp/coolj
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Memory information:
((conses 16 3220055 2243012) (symbols 48 103120 166) (strings 32 562693 102722)
(string-bytes 1 18216704) (vectors 16 196012) (vector-slots 8 3208841 1034054) (floats 8 960 11509)
(intervals 56 146966 72829) (buffers 992 72))
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997,2003 nCipher Corporation Ltd,
1994-97 Ian Jackson.