Package: emacs;
Reported by: Rahguzar <rahguzar <at> zohomail.eu>
Date: Thu, 10 Aug 2023 17:20:02 UTC
Severity: normal
Found in version 29.1
Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Rahguzar <rahguzar <at> zohomail.eu> To: bug-gnu-emacs <at> gnu.org Subject: 29.1; Tall images in 'image-mode' can't be scrolled with 'pixel-scroll-precision-mode' on Date: Thu, 10 Aug 2023 19:05:03 +0200
Dear Emacs developers,
To reproduce starting from 'emacs -Q' visit an image file. Then
repeatedly use 'i +' till the image is taller than the window. The
image can be scrolled using mouse wheel. Now do
M-x pixel-scroll-precision-mode
After this attempting to scroll the image will set the vscroll to 0
and then image can't be scrolled at all.
From some investigation it seems like this behavior is not specific
to image-mode. Another way to reproduce the behavior is to evaluate
the following lisp code,
(let* ((win (display-buffer (get-buffer-create "image-pixel-precision-test")))
(height (* (window-text-height win t) 2))
(file "path/to/image"))
(select-window win)
(erase-buffer)
(insert-image (create-image file nil nil))
(goto-char 1)
(pixel-scroll-precision-mode)
nil)
This image thus displayed can not be scrolled. However if the code
above is slightly modified to insert a new line after the image,
scrolling can be done normally, i.e.
(let* ((win (display-buffer (get-buffer-create "image-pixel-precision-test")))
(height (* (window-text-height win t) 2))
(file "path/to/image"))
(select-window win)
(erase-buffer)
(insert-image (create-image file nil nil))
(insert "\n")
(goto-char 1)
(pixel-scroll-precision-mode)
nil)
produces an image that can be scrolled. Inserting a newline after the
text covered by the text property holding the image also fixes the
problem in 'image-mode' but that doesn't seem like the right fix to me.
Rahguzar
In GNU Emacs 29.1 (build 1, x86_64-suse-linux-gnu, GTK+ Version 3.24.38,
cairo version 1.17.8) of 2023-08-07 built on lamb11
System Description: openSUSE Tumbleweed
Configured using:
'configure --host=x86_64-suse-linux-gnu --build=x86_64-suse-linux-gnu
--program-prefix= --disable-dependency-tracking --prefix=/usr
--exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin
--sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include
--libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var
--sharedstatedir=/var/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-pgtk --with-native-compilation=aot
--with-cairo --with-libotf --with-jpeg --with-tiff --with-gif
--with-png --with-rsvg --with-xft --with-xml2 --with-dbus --with-sound
--with-json --with-mailutils --with-gnutls --with-tree-sitter
--enable-locallisppath=/usr/share/emacs/29.1/site-lisp:/usr/share/emacs/site-lisp
'CFLAGS=-O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3
-fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables
-fstack-clash-protection -Werror=return-type -flto=auto'
LDFLAGS=-Wl,-O2'
Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER XIM GTK3 ZLIB
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: mu4e:main
Minor modes in effect:
recentf-mode: t
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dirvish-override-dired-mode: t
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pixel-scroll-precision-mode: t
repeat-mode: t
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size-indication-mode: t
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abbrev-mode: t
Load-path shadows:
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Features:
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Memory information:
((conses 16 838555 316547)
(symbols 48 42792 15)
(strings 32 169060 12011)
(string-bytes 1 5569967)
(vectors 16 93707)
(vector-slots 8 1658949 153955)
(floats 8 1309 1539)
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(buffers 984 18))
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