bug#35740: 26.1; scroll bar jaggies / tearing

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bug#35740: 26.1; scroll bar jaggies / tearing

Bob Hepple

In GNU Emacs 26.1 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.23.2)
 of 2018-08-13 built on buildvm-13.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.12004000
System Description:    Fedora release 29 (Twenty Nine)

Recent messages:
.emacs.d/modules/ohai-ido.el: ‘flet’ is an obsolete macro (as of 24.3); use either ‘cl-flet’ or ‘cl-letf’.
Loading rich-minority...done
Loading smart-mode-line...done
Loading /home/bhepple/.emacs.d/user.el (source)...
Loading /home/bhepple/.emacs.d/gk-ibuffer.el (source)...done
Loading /home/bhepple/.emacs.d/recentf...done
Cleaning up the recentf list...done (0 removed)
Loading /home/bhepple/.emacs.d/user.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Mark saved where search started

Configured using:
 'configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-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-dbus --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
 --with-gpm=no --with-xwidgets --with-modules
 build_alias=x86_64-redhat-linux-gnu host_alias=x86_64-redhat-linux-gnu
 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g -pipe -Wall -Werror=format-security
 -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions
 -fstack-protector-strong -grecord-gcc-switches
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
 -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
 LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY ACL
LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES THREADS XWIDGETS LCMS2

Important settings:
  value of $LC_ALL: en_AU.utf8
  value of $LANG: C
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: Org

Minor modes in effect:
  popwin-mode: t
  global-hl-line-mode: t
  recentf-mode: t
  rich-minority-mode: t
  which-key-mode: t
  projectile-mode: t
  global-ethan-wspace-mode: t
  ethan-wspace-mode: t
  ethan-wspace-clean-many-nls-eof-mode: t
  ethan-wspace-clean-no-nl-eof-mode: t
  ethan-wspace-highlight-eol-mode: t
  ethan-wspace-highlight-tabs-mode: t
  company-quickhelp-mode: t
  company-quickhelp-local-mode: t
  global-company-mode: t
  global-anzu-mode: t
  anzu-mode: t
  flx-ido-mode: t
  ido-vertical-mode: t
  ido-ubiquitous-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  which-function-mode: t
  override-global-mode: t
  show-paren-mode: t
  cl-old-struct-compat-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Load-path shadows:
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ox-org hides /usr/share/emacs/26.1/lisp/org/ox-org
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-compat hides /usr/share/emacs/26.1/lisp/org/org-compat
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-comint hides /usr/share/emacs/26.1/lisp/org/ob-comint
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-duration hides /usr/share/emacs/26.1/lisp/org/org-duration
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-exp hides /usr/share/emacs/26.1/lisp/org/ob-exp
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-lua hides /usr/share/emacs/26.1/lisp/org/ob-lua
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-python hides /usr/share/emacs/26.1/lisp/org/ob-python
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-lilypond hides /usr/share/emacs/26.1/lisp/org/ob-lilypond
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-ctags hides /usr/share/emacs/26.1/lisp/org/org-ctags
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-hledger hides /usr/share/emacs/26.1/lisp/org/ob-hledger
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-mouse hides /usr/share/emacs/26.1/lisp/org/org-mouse
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-perl hides /usr/share/emacs/26.1/lisp/org/ob-perl
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-archive hides /usr/share/emacs/26.1/lisp/org/org-archive
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-css hides /usr/share/emacs/26.1/lisp/org/ob-css
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-indent hides /usr/share/emacs/26.1/lisp/org/org-indent
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-mobile hides /usr/share/emacs/26.1/lisp/org/org-mobile
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-makefile hides /usr/share/emacs/26.1/lisp/org/ob-makefile
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-faces hides /usr/share/emacs/26.1/lisp/org/org-faces
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-gnuplot hides /usr/share/emacs/26.1/lisp/org/ob-gnuplot
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-calc hides /usr/share/emacs/26.1/lisp/org/ob-calc
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-abc hides /usr/share/emacs/26.1/lisp/org/ob-abc
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-lint hides /usr/share/emacs/26.1/lisp/org/org-lint
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-datetree hides /usr/share/emacs/26.1/lisp/org/org-datetree
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-shell hides /usr/share/emacs/26.1/lisp/org/ob-shell
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-sass hides /usr/share/emacs/26.1/lisp/org/ob-sass
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-forth hides /usr/share/emacs/26.1/lisp/org/ob-forth
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-element hides /usr/share/emacs/26.1/lisp/org/org-element
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-entities hides /usr/share/emacs/26.1/lisp/org/org-entities
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org hides /usr/share/emacs/26.1/lisp/org/org
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-eshell hides /usr/share/emacs/26.1/lisp/org/org-eshell
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-colview hides /usr/share/emacs/26.1/lisp/org/org-colview
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-bbdb hides /usr/share/emacs/26.1/lisp/org/org-bbdb
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-sql hides /usr/share/emacs/26.1/lisp/org/ob-sql
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-haskell hides /usr/share/emacs/26.1/lisp/org/ob-haskell
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-latex hides /usr/share/emacs/26.1/lisp/org/ob-latex
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ox-publish hides /usr/share/emacs/26.1/lisp/org/ox-publish
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-inlinetask hides /usr/share/emacs/26.1/lisp/org/org-inlinetask
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-pcomplete hides /usr/share/emacs/26.1/lisp/org/org-pcomplete
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-src hides /usr/share/emacs/26.1/lisp/org/org-src
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ox hides /usr/share/emacs/26.1/lisp/org/ox
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-ref hides /usr/share/emacs/26.1/lisp/org/ob-ref
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ox-beamer hides /usr/share/emacs/26.1/lisp/org/ox-beamer
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-protocol hides /usr/share/emacs/26.1/lisp/org/org-protocol
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-docview hides /usr/share/emacs/26.1/lisp/org/org-docview
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-gnus hides /usr/share/emacs/26.1/lisp/org/org-gnus
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-feed hides /usr/share/emacs/26.1/lisp/org/org-feed
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-list hides /usr/share/emacs/26.1/lisp/org/org-list
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-plantuml hides /usr/share/emacs/26.1/lisp/org/ob-plantuml
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-lisp hides /usr/share/emacs/26.1/lisp/org/ob-lisp
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-java hides /usr/share/emacs/26.1/lisp/org/ob-java
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-timer hides /usr/share/emacs/26.1/lisp/org/org-timer
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-clojure hides /usr/share/emacs/26.1/lisp/org/ob-clojure
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-C hides /usr/share/emacs/26.1/lisp/org/ob-C
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-core hides /usr/share/emacs/26.1/lisp/org/ob-core
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-ocaml hides /usr/share/emacs/26.1/lisp/org/ob-ocaml
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-emacs-lisp hides /usr/share/emacs/26.1/lisp/org/ob-emacs-lisp
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-plot hides /usr/share/emacs/26.1/lisp/org/org-plot
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ox-ascii hides /usr/share/emacs/26.1/lisp/org/ox-ascii
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-bibtex hides /usr/share/emacs/26.1/lisp/org/org-bibtex
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-info hides /usr/share/emacs/26.1/lisp/org/org-info
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-rmail hides /usr/share/emacs/26.1/lisp/org/org-rmail
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-footnote hides /usr/share/emacs/26.1/lisp/org/org-footnote
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-groovy hides /usr/share/emacs/26.1/lisp/org/ob-groovy
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-w3m hides /usr/share/emacs/26.1/lisp/org/org-w3m
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-clock hides /usr/share/emacs/26.1/lisp/org/org-clock
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-J hides /usr/share/emacs/26.1/lisp/org/ob-J
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ox-texinfo hides /usr/share/emacs/26.1/lisp/org/ox-texinfo
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-tangle hides /usr/share/emacs/26.1/lisp/org/ob-tangle
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-octave hides /usr/share/emacs/26.1/lisp/org/ob-octave
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-sed hides /usr/share/emacs/26.1/lisp/org/ob-sed
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-habit hides /usr/share/emacs/26.1/lisp/org/org-habit
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-shen hides /usr/share/emacs/26.1/lisp/org/ob-shen
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-org hides /usr/share/emacs/26.1/lisp/org/ob-org
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-eval hides /usr/share/emacs/26.1/lisp/org/ob-eval
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-table hides /usr/share/emacs/26.1/lisp/org/ob-table
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-fortran hides /usr/share/emacs/26.1/lisp/org/ob-fortran
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-picolisp hides /usr/share/emacs/26.1/lisp/org/ob-picolisp
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob hides /usr/share/emacs/26.1/lisp/org/ob
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-io hides /usr/share/emacs/26.1/lisp/org/ob-io
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-scheme hides /usr/share/emacs/26.1/lisp/org/ob-scheme
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-irc hides /usr/share/emacs/26.1/lisp/org/org-irc
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-ebnf hides /usr/share/emacs/26.1/lisp/org/ob-ebnf
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-id hides /usr/share/emacs/26.1/lisp/org/org-id
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-R hides /usr/share/emacs/26.1/lisp/org/ob-R
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/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-macro hides /usr/share/emacs/26.1/lisp/org/org-macro
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-attach hides /usr/share/emacs/26.1/lisp/org/org-attach
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ox-html hides /usr/share/emacs/26.1/lisp/org/ox-html
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-keys hides /usr/share/emacs/26.1/lisp/org/ob-keys
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-awk hides /usr/share/emacs/26.1/lisp/org/ob-awk
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-maxima hides /usr/share/emacs/26.1/lisp/org/ob-maxima
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/org-loaddefs hides /usr/share/emacs/26.1/lisp/org/org-loaddefs
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-dot hides /usr/share/emacs/26.1/lisp/org/ob-dot
/home/bhepple/.emacs.d/elpa/org-plus-contrib-20181230/ob-asymptote hides /usr/share/emacs/26.1/lisp/org/ob-asymptote

Features:
(shadow sort mail-extr emacsbug sendmail smex misearch multi-isearch
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org-gnus nnir gnus-sum gnus-group gnus-undo gnus-start gnus-cloud nnimap
nnmail mail-source tls gnutls utf7 netrc nnoo parse-time gnus-spec
gnus-int gnus-range message rmc puny rfc822 mml mml-sec epa epg
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader gnus-win gnus nnheader gnus-util rmail rmail-loaddefs rfc2047
rfc2045 ietf-drums mail-utils mm-util mail-prsvr org-docview doc-view
jka-compr org-bibtex bibtex org-bbdb org-w3m .emacs vc vc-dispatcher
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Memory information:
((conses 16 636948 101912)
 (symbols 48 49456 2)
 (miscs 40 1253 6535)
 (strings 32 163905 48166)
 (string-bytes 1 4592363)
 (vectors 16 84249)
 (vector-slots 8 2127567 299808)
 (floats 8 303 477)
 (intervals 56 4448 2270)
 (buffers 992 14))

When I drift the sprite (mouse cursor) in and out of emacs the scroll
bar goes a little bit crazy with animated jaggies running up and down
its length. No other window (eg terminals, firefox etc) shows this
artifact.

I've put up a video of the glitch at https://youtu.be/EMa1OWDhVS4. It
shows both emacs -Q and plain emacs running.

The hardware is hardly underpowered - Dell XPS L502X i7 laptop with
intel graphics.

    this is fedora-29 and emacs-26.1-6.fc29.x86_64 as well as emacs-26.2
    compiled from source

    the problem occurs with 'emacs -Q' as well as plain 'emacs'

    the problem occurs with i3wm and lxde but is resolved with compton
    or any compositing WM such as gnome

    the problem is not resolved with kvm/modesetting driver instead of
    xorg-x11-drv-intel

    the problem is resolved with emacs compiled with the athena/motif
    or lucid toolkits

    the problem is slightly alleviated by using emacs compiled with the
    gtk2 toolkit

    the problem does not occur on my media servers - 55" TV via HDMI
    with lxde on fedora-29 or raspbian

    one person has reported (on /r/emacs) that they can duplicate the
    problem on their laptop (an XPS 13 Haswell) as well as an AMD Vega
    desktop

While an extremely minor annoyance, it remains irritating and shows
emacs in a bad light. Is it possible that emacs is doing something weird
/ sophisticated with the scroll bar?

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bug#35740: 26.1; scroll bar jaggies / tearing

Noam Postavsky
Bob Hepple <[hidden email]> writes:

> When I drift the sprite (mouse cursor) in and out of emacs the scroll
> bar goes a little bit crazy with animated jaggies running up and down
> its length. No other window (eg terminals, firefox etc) shows this
> artifact.
>
> I've put up a video of the glitch at https://youtu.be/EMa1OWDhVS4. It
> shows both emacs -Q and plain emacs running.

Does disabling double buffering have any effect?

    (modify-all-frames-parameters '((inhibit-double-buffering . t)))



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bug#35740: 26.1; scroll bar jaggies / tearing

Noam Postavsky
In reply to this post by Bob Hepple
[forwarding to list, please use "Reply All" to keep [hidden email] on Cc]


> (modify-all-frames-parameters '((inhibit-double-buffering . t)))

... has no effect at all

Cheers

Bob