GNU bug report logs - #64252
29.0.91; pixel-scroll-precision-mode scrolling jumps with large images

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From: Rahguzar <rahguzar <at> zohomail.eu>
To: 64252 <at> debbugs.gnu.org
Subject: bug#64252: 29.0.91; pixel-scroll-precision-mode scrolling jumps with large images
Date: Fri, 23 Jun 2023 16:18:31 +0200

Dear Emacs developers,

Starting with `emacs -Q`, paste the following code in scratch buffer

(let* ((win (display-buffer (get-buffer-create "image-pixel-precision-test")))
       (height (/ (window-text-height win t) 3))
       (file "path-to-some-image-file"))
  (select-window win)
  (erase-buffer)
  (insert-image (create-image file nil nil :height height))
  (insert "\n")
  (insert-image (create-image file nil nil :height (* 2 height)))
  (insert "\n")
  (insert-image (create-image file nil nil :height (* 3 height)))
  (insert "\n")
  (goto-char 1)
  (pixel-scroll-precision-mode)
  nil)

after replacing the binding of variable 'file' with the path to some
existing image. This should selected a window with three images. The
first one take up 1/3 of the window and the second one 2/3 of the
window. The third image is off screen has height equal to the window.
The point is on the first image. Now try to scroll the image using mouse
wheel or track pad. When scrolling starts the point moves to 2nd image
but scrolling works as expected as long some part of the second image is
in view. However as soon as the first image is out of view, any
scrolling results in the second image disappearing and window being
filled with the 3rd image.

As far as I can tell this is not limited to pixel-scroll-precision mode
and is part of Emacs scrolling behavior, but in

https://lists.gnu.org/archive/html/help-gnu-emacs/2023-06/msg00199.html

Eli said that pixel-scroll-precision-mode can handle this scenario but
in my testing it cannot. As far as I can tell in Emacs partial scrolling
works well if there is either 1) a line that is completely visible in
the window or 2) a line that is bigger than the window. However when
both of the these conditions are not satisfied it is only possible to
scroll in line sized jumps. This happens for example when there are two
images which are individually less tall than the window but their
combined height is more than the window. My suspicion is that this is
related to how 'set-window-start' operates and in the scenario outlined
above it moves the window content to make a whole line visible.

I tried setting 'global-disable-point-adjustment' to see if it helps but
it doesn't.


In GNU Emacs 29.0.91 (build 1, x86_64-suse-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.17.8) of 2023-06-20 built on lamb78
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/29.0.91/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
  save-place-mode: t
  global-so-long-mode: t
  global-evil-surround-mode: t
  evil-surround-mode: t
  eros-mode: t
  projectile-mode: t
  which-key-mode: t
  savehist-mode: t
  better-jumper-mode: t
  better-jumper-local-mode: t
  global-company-mode: t
  company-mode: t
  vertico-mode: t
  all-the-icons-completion-mode: t
  marginalia-mode: t
  evil-goggles-mode: t
  evil-escape-mode: t
  evil-snipe-override-mode: t
  evil-snipe-mode: t
  gcmh-mode: t
  winner-mode: t
  smartparens-global-mode: t
  ws-butler-global-mode: t
  undo-fu-session-global-mode: t
  undo-fu-mode: t
  satchel-mode: t
  mu4e-search-minor-mode: t
  global-hl-line-mode: t
  hl-line-mode: t
  mu4e-update-minor-mode: t
  mu4e-context-minor-mode: t
  dirvish-override-dired-mode: t
  server-mode: t
  repeat-mode: t
  evil-mode: t
  evil-local-mode: t
  windmove-mode: t
  +popup-mode: t
  +modeline-global-mode: t
  +modeline-mode: t
  override-global-mode: t
  general-override-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  window-divider-mode: t
  buffer-read-only: t
  size-indication-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  abbrev-mode: t

Load-path shadows:
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/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-obsolete hides /usr/share/emacs/site-lisp/mu4e/mu4e-obsolete
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/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-main hides /usr/share/emacs/site-lisp/mu4e/mu4e-main
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-helpers hides /usr/share/emacs/site-lisp/mu4e/mu4e-helpers
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-headers hides /usr/share/emacs/site-lisp/mu4e/mu4e-headers
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-folders hides /usr/share/emacs/site-lisp/mu4e/mu4e-folders
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-draft hides /usr/share/emacs/site-lisp/mu4e/mu4e-draft
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-contrib hides /usr/share/emacs/site-lisp/mu4e/mu4e-contrib
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-context hides /usr/share/emacs/site-lisp/mu4e/mu4e-context
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-compose hides /usr/share/emacs/site-lisp/mu4e/mu4e-compose
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-bookmarks hides /usr/share/emacs/site-lisp/mu4e/mu4e-bookmarks
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-actions hides /usr/share/emacs/site-lisp/mu4e/mu4e-actions
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-speedbar hides /usr/share/emacs/site-lisp/mu4e/mu4e-speedbar
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-lists hides /usr/share/emacs/site-lisp/mu4e/mu4e-lists
/home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-contacts hides /usr/share/emacs/site-lisp/mu4e/mu4e-contacts

Features:
(shadow emacsbug evil-collection-xref xref company-ispell
company-yasnippet company-dabbrev delsel jka-compr whitespace
adaptive-wrap face-remap recentf tree-widget saveplace
evil-collection-so-long so-long evil-collection-helpful helpful cc-langs
cc-vars cc-defs evil-collection-imenu imenu trace evil-collection-edebug
edebug evil-collection-debug debug backtrace info-look
evil-collection-info info f f-shortdoc help-fns radix-tree
evil-collection-elisp-refs elisp-refs s vertico-directory hide-mode-line
org-crypt evil-embrace evil-surround eros highlight-quoted
rainbow-delimiters highlight-numbers parent-mode hl-todo
evil-collection-elisp-mode elisp-mode org-eldoc embrace expand-region
text-mode-expansions the-org-mode-expansions er-basic-expansions
expand-region-core expand-region-custom cdlatex texmathp toc-org
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org-persist xdg org-id org-refile avl-tree generator ol-bibtex
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goto-addr avy sort gnus-cite smiley shr-color mm-archive mail-extr
textsec uni-scripts idna-mapping ucs-normalize uni-confusable
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nnmh nnfolder cursor-sensor vertico-repeat epa-file network-stream nsm
gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-msg nntp
gnus-cache evil-collection-which-key which-key savehist better-jumper
company-capf company evil-collection-vertico vertico orderless
all-the-icons-completion marginalia compat evil-goggles pulse color
evil-easymotion evil-escape evil-snipe autorevert filenotify gcmh winner
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hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo gtk pgtk
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Memory information:
((conses 16 1112649 163180)
 (symbols 48 47706 27)
 (strings 32 197743 25767)
 (string-bytes 1 7031793)
 (vectors 16 120738)
 (vector-slots 8 2076120 174082)
 (floats 8 1459 2514)
 (intervals 56 75919 1751)
 (buffers 984 23))

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