Public bug reported:

A change was introduced on GTK+3 that makes scrolling by clicking on
scrollbar steppers unusable, at a rate of about just 1 line per second,
as reported by some users on multiple channels:

* 
https://askubuntu.com/questions/732796/ubuntu-15-10-slow-stepper-scrolling-in-terminal
* https://mail.gnome.org/archives/gnome-list/2015-October/msg00006.html
* https://lists.ubuntu.com/archives/xubuntu-users/2017-November/010358.html

Currently, the only way to scroll by using the steppers is by RIGHT-
CLICKING on them, which is non-standard behaviour, which could be
considered as an accessibility issue, as it is only documented in the
GTK+ changelog:

https://abi-laboratory.pro/tracker/changelog/gtk+/3.18.2/log.html
* GtkScrolledWindow
 - Keep scrollbars below treeview headers
 - Switch the roles of secondary and middle click on scrollbar steppers
   - Primary click starts low-speed autoscrolling
   - Secondary click start high-speed autoscrolling
   - Middle click scrolls to the end
 - Tweak button bindings on scrollbars (and scales)
   - Primary click warps to the location
   - Primary click with Shift jumps by pages
   - Secondary click starts variable-speed autoscrolling

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: libgtk-3-0 3.22.24-0ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Nov 10 17:22:08 2017
InstallationDate: Installed on 2017-04-23 (201 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: gtk+3.0
UpgradeStatus: Upgraded to artful on 2017-10-28 (13 days ago)

** Affects: gtk+3.0 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to gtk+3.0 in Ubuntu.
https://bugs.launchpad.net/bugs/1731533

Title:
  Scrolling by clicking on steppers unbearably slow

Status in gtk+3.0 package in Ubuntu:
  New

Bug description:
  A change was introduced on GTK+3 that makes scrolling by clicking on
  scrollbar steppers unusable, at a rate of about just 1 line per
  second, as reported by some users on multiple channels:

  * 
https://askubuntu.com/questions/732796/ubuntu-15-10-slow-stepper-scrolling-in-terminal
  * https://mail.gnome.org/archives/gnome-list/2015-October/msg00006.html
  * https://lists.ubuntu.com/archives/xubuntu-users/2017-November/010358.html

  Currently, the only way to scroll by using the steppers is by RIGHT-
  CLICKING on them, which is non-standard behaviour, which could be
  considered as an accessibility issue, as it is only documented in the
  GTK+ changelog:

  https://abi-laboratory.pro/tracker/changelog/gtk+/3.18.2/log.html
  * GtkScrolledWindow
   - Keep scrollbars below treeview headers
   - Switch the roles of secondary and middle click on scrollbar steppers
     - Primary click starts low-speed autoscrolling
     - Secondary click start high-speed autoscrolling
     - Middle click scrolls to the end
   - Tweak button bindings on scrollbars (and scales)
     - Primary click warps to the location
     - Primary click with Shift jumps by pages
     - Secondary click starts variable-speed autoscrolling

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: libgtk-3-0 3.22.24-0ubuntu1
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Nov 10 17:22:08 2017
  InstallationDate: Installed on 2017-04-23 (201 days ago)
  InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: gtk+3.0
  UpgradeStatus: Upgraded to artful on 2017-10-28 (13 days ago)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1731533/+subscriptions

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