Bug#893511: gnome-core: "Slow keys" a11y shortcut being spuriously triggered

[George Bateman]

Package: gnome-core
Severity: important
Tags: a11y

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Dear Maintainer,

(NB: I don't have gnome-core itelf installed, just a subset, but it
seemed to be the most appropriate thing for me to file this against.)

I've used Gnome 3 for a couple of years, and very recently I've noticed
that "Slow keys" is repeatedly attempting to get switched on. If I hold
the shift key (even, intermittently, for what I suspect is less
than 8 seconds) I see a dialog:

 Slow keys turned on

 You just held down the shift key for 8 seconds. This is the shortcut
 for the Slow Keys feature, which affects the way your keyboard works.

This is despite accessibility shortcuts being switched off in Settings →
Universal Access → Typing Assist (AssistX) → Enable by keyboard.
Toggling this setting on and off does not make the dialogs stop either.

The dialogs are quite frequent and disruptive, and there doesn't seem
to be anything I can do to stop them, hence my "important" rating.

Any help would be appreciated.

Many thanks,
George Bateman.

- -- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'proposed-updates'), (500, 'oldstable-proposed-updates'), (500, 'unstable'), (500, 'stable'), (500, 'oldstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.14.0-3-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gnome-core depends on:
ii  adwaita-icon-theme            3.27.90-1
ii  at-spi2-core                  2.28.0-1
pn  baobab                        <none>
pn  caribou                       <none>
pn  caribou-antler                <none>
pn  chrome-gnome-shell            <none>
ii  chromium                      62.0.3202.89-1
ii  dconf-cli                     0.26.1-3
ii  dconf-gsettings-backend       0.26.1-3
pn  dconf-tools                   <none>
pn  empathy                       <none>
ii  eog                           3.27.91-1
ii  evince                        3.27.92-1
ii  evolution-data-server         3.26.5-2
ii  fonts-cantarell               0.0.25-4
ii  gdm3                          3.26.2.1-3
pn  gedit                         <none>
ii  gkbd-capplet                  3.26.0-3
ii  glib-networking               2.54.1-2
ii  gnome-backgrounds             3.27.90-1
pn  gnome-bluetooth               <none>
pn  gnome-calculator              <none>
pn  gnome-characters              <none>
pn  gnome-contacts                <none>
ii  gnome-control-center          1:3.27.92-1
pn  gnome-dictionary              <none>
pn  gnome-disk-utility            <none>
ii  gnome-font-viewer             3.27.90-2
ii  gnome-keyring                 3.20.1-2
pn  gnome-logs                    <none>
ii  gnome-menus                   3.13.3-11
pn  gnome-online-accounts         <none>
pn  gnome-online-miners           <none>
pn  gnome-packagekit              <none>
ii  gnome-screenshot              3.26.0-3
ii  gnome-session                 3.27.92-1
ii  gnome-settings-daemon         3.26.2-1+b1
ii  gnome-shell                   3.27.92-2
ii  gnome-shell-extensions        3.27.92-2
pn  gnome-software                <none>
pn  gnome-sushi                   <none>
ii  gnome-system-log              3.9.90-5
ii  gnome-system-monitor          3.26.0-3
ii  gnome-terminal                3.27.92-1
ii  gnome-themes-extra            3.27.90.1-1
ii  gnome-themes-standard         3.27.90.1-1
pn  gnome-user-docs               <none>
pn  gnome-user-guide              <none>
pn  gnome-user-share              <none>
ii  gsettings-desktop-schemas     3.27.92-1
pn  gstreamer1.0-packagekit       <none>
ii  gstreamer1.0-plugins-base     1.12.4-1
ii  gstreamer1.0-plugins-good     1.12.4-1+b1
ii  gstreamer1.0-pulseaudio       1.12.4-1+b1
pn  gtk2-engines                  <none>
pn  gucharmap                     <none>
ii  gvfs-backends                 1.34.1-2
ii  gvfs-bin                      1.34.1-2
ii  gvfs-fuse                     1.34.1-2
pn  iceweasel                     <none>
pn  libatk-adaptor                <none>
ii  libcanberra-pulse             0.30-6
pn  libcaribou-gtk-module         <none>
pn  libcaribou-gtk3-module        <none>
ii  libgtk-3-common               3.22.28-1
ii  libpam-gnome-keyring          3.20.1-2
pn  libproxy1-plugin-gsettings    <none>
ii  metacity                      1:3.26.0-1
pn  mousetweaks                   <none>
ii  nautilus                      3.26.2-2+b1
pn  policykit-1-gnome             <none>
ii  pulseaudio                    11.1-4
ii  sound-theme-freedesktop       0.8-2
pn  system-config-printer-common  <none>
pn  system-config-printer-udev    <none>
pn  totem                         <none>
pn  tracker                       <none>
pn  tracker-gui                   <none>
pn  vino                          <none>
ii  yelp                          3.26.0-2
ii  zenity                        3.28.0-1

Versions of packages gnome-core recommends:
ii  anacron                          2.3-24
pn  libproxy1-plugin-networkmanager  <none>
pn  network-manager-gnome            <none>

Versions of packages gnome-core suggests:
pn  gnome  <none>

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