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

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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: 29.0.91; 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
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Message #8 received at 64252 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Rahguzar <rahguzar <at> zohomail.eu>
Cc: 64252 <at> debbugs.gnu.org
Subject: Re: bug#64252: 29.0.91;
 pixel-scroll-precision-mode scrolling jumps with large images
Date: Fri, 23 Jun 2023 17:56:59 +0300

> Date: Fri, 23 Jun 2023 16:18:31 +0200
> From:  Rahguzar via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> 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.

I said that pixel-scroll-precision-mode can vscroll a window when
there's an image in the window, something you claimed there you cannot
make Emacs do.

> 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.

Why is that a problem?  You describe some behavior in some specific
situation, but don't say why it's a problem we need to investigate,
let alone fix.

Message #11 received at 64252 <at> debbugs.gnu.org (full text, mbox):

From: Rahguzar <rahguzar <at> zohomail.eu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 64252 <at> debbugs.gnu.org
Subject: Re: bug#64252: 29.0.91; pixel-scroll-precision-mode scrolling jumps
 with large images
Date: Fri, 23 Jun 2023 17:04:10 +0200

Hi Eli,

Eli Zaretskii <eliz <at> gnu.org> writes:

> I said that pixel-scroll-precision-mode can vscroll a window when
> there's an image in the window, something you claimed there you cannot
> make Emacs do.

Sorry, I wasn't very clear in that message to which you responded.

>> 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.
>
> Why is that a problem?  You describe some behavior in some specific
> situation, but don't say why it's a problem we need to investigate,
> let alone fix.

It is certainly a pretty minor problem. The reason it would be nice is
to be able to partially scroll such images is to view documents like
pdfs. The biggest part of the problem can already be solved by the tools
Emacs already has, since it is possible to reliably scroll pages larger
than a window. For small pages, scrolling one page at a time is not so
bad but more mine grained scrolling would be nice.

Message #14 received at 64252 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Rahguzar <rahguzar <at> zohomail.eu>
Cc: 64252 <at> debbugs.gnu.org
Subject: Re: bug#64252: 29.0.91; pixel-scroll-precision-mode scrolling jumps
 with large images
Date: Sat, 24 Jun 2023 09:29:06 +0800

Rahguzar <rahguzar <at> zohomail.eu> writes:

> 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:
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/emacsql/emacsql-sqlite-builtin hides /home/azeem/.emacs.d/.local/straight/build-29.0.91/emacsql-sqlite-builtin/emacsql-sqlite-builtin
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/citar-embark/citar-embark hides /home/azeem/.emacs.d/.local/straight/build-29.0.91/citar/citar-embark
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-view hides /usr/share/emacs/site-lisp/mu4e/mu4e-view
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-search hides /usr/share/emacs/site-lisp/mu4e/mu4e-search
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-query-items hides /usr/share/emacs/site-lisp/mu4e/mu4e-query-items
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-org hides /usr/share/emacs/site-lisp/mu4e/mu4e-org
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-notification hides /usr/share/emacs/site-lisp/mu4e/mu4e-notification
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-icalendar hides /usr/share/emacs/site-lisp/mu4e/mu4e-icalendar
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-config hides /usr/share/emacs/site-lisp/mu4e/mu4e-config
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-window hides /usr/share/emacs/site-lisp/mu4e/mu4e-window
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-modeline hides /usr/share/emacs/site-lisp/mu4e/mu4e-modeline
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e hides /usr/share/emacs/site-lisp/mu4e/mu4e
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-vars hides /usr/share/emacs/site-lisp/mu4e/mu4e-vars
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-update hides /usr/share/emacs/site-lisp/mu4e/mu4e-update
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-server hides /usr/share/emacs/site-lisp/mu4e/mu4e-server
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-obsolete hides /usr/share/emacs/site-lisp/mu4e/mu4e-obsolete
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-message hides /usr/share/emacs/site-lisp/mu4e/mu4e-message
> /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-mark hides /usr/share/emacs/site-lisp/mu4e/mu4e-mark
> /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
> evil-org display-line-numbers jit-spell ispell org-indent org-element
> org-persist xdg org-id org-refile avl-tree generator ol-bibtex
> gnus-async gnus-bcklg gnus-ml disp-table auto-minor-mode link-hint ffap
> goto-addr avy sort gnus-cite smiley shr-color mm-archive mail-extr
> textsec uni-scripts idna-mapping ucs-normalize uni-confusable
> textsec-check qp projectile lisp-mnt evil-collection-grep grep nndraft
> 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
> smartparens-config smartparens-text smartparens dash ws-butler
> undo-fu-session undo-fu satchel ibuf-ext evil-collection-ibuffer ibuffer
> ibuffer-loaddefs desktop frameset mu4e mu4e-org evil-collection-org
> smartparens-org org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro
> org-src ob-comint org-pcomplete pcomplete org-list org-footnote
> org-faces org-entities noutline outline ob-emacs-lisp ob-core ob-eval
> org-cycle org-table ol org-fold org-fold-core org-keys oc-natbib oc-csl
> bibtex oc-biblatex oc org-loaddefs find-func org-version org-compat
> org-macs mu4e-notification notifications mu4e-main mu4e-view gnus-art
> mm-uu mml2015 mm-view mml-smime smime gnutls dig gnus-sum gnus-group
> gnus-undo gnus-start gnus-dbus dbus gnus-cloud nnimap nnmail mail-source
> utf7 nnoo parse-time iso8601 gnus-spec gnus-int gnus-range gnus-win
> evil-collection-gnus gnus nnheader range evil-collection-calendar
> cal-menu calendar cal-loaddefs mu4e-headers mu4e-compose mu4e-draft
> mu4e-actions smtpmail mu4e-search mu4e-lists mu4e-bookmarks mu4e-mark
> mu4e-message shr pixel-fill kinsoku url-file svg xml dom browse-url url
> url-proxy url-privacy url-expand url-methods url-history url-cookie
> generate-lisp-file url-domsuf url-util url-parse auth-source json map
> url-vars flow-fill mule-util hl-line mu4e-contacts mu4e-update
> mu4e-folders mu4e-context mu4e-query-items mu4e-server mu4e-modeline
> mu4e-vars mu4e-helpers mu4e-config mu4e-window evil-collection-bookmark
> bookmark ido message sendmail mailcap yank-media puny dirvish transient
> format-spec eieio eieio-core evil-collection-dired dired dired-loaddefs
> rfc822 mml mml-sec password-cache evil-collection-epa epa epg rfc6068
> epg-config gnus-util time-date mm-decode mm-bodies mm-encode mail-parse
> rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr mailabbrev
> mail-utils gmm-utils mailheader mu4e-obsolete server dtrt-indent
> ef-spring-theme ef-themes repeat midnight evil-collection-flymake
> flymake-proc flymake project evil-collection-compile
> evil-collection-custom cus-edit cus-load wid-edit evil-collection-comint
> evil-collection annalist compile text-property-search comint ansi-osc
> ansi-color html2text let-alist ibuf-macs evil evil-integration evil-maps
> evil-commands reveal evil-jumps evil-command-window evil-search
> evil-types evil-macros evil-repeat evil-states evil-core byte-opt advice
> evil-common windmove calc calc-loaddefs calc-macs thingatpt rect
> evil-digraphs evil-vars ring all-the-icons all-the-icons-faces
> data-material data-weathericons data-octicons data-fileicons
> data-faicons data-alltheicons derived edmacro kmacro
> use-package-bind-key bind-key comp comp-cstr warnings icons rx
> doom-editor doom-projects doom-ui easy-mmode doom-keybinds pp cl-extra
> help-mode use-package-core bytecomp byte-compile general tex-site
> doom-start doom-modules cl-seq doom doom-lib cl-macs cl-loaddefs cl-lib
> pcase gv jansson dynamic-modules subr-x rmc iso-transl tooltip cconv
> eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
> term/pgtk-win pgtk-win term/common-win pgtk-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
> dynamic-setting system-font-setting font-render-setting cairo gtk pgtk
> multi-tty make-network-process native-compile emacs)
>
> 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))

If an image is larger than the window, pixel-scroll-precision-mode is
unable to determine a position of point that will not cause redisplay to
recenter the window after scrolling takes place.

There is definitely a solution to this problem, but I haven't found it
yet.  Patches welcome.

Thanks.

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GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.