[Bug 1826196] [NEW] The Dock cannot scroll without a mouse when multiple programs are open

[John]

Public bug reported:

This only happened after upgrading to 19.04.

Everything works fine if i attach a mouse to my laptop. But without it i
cannot scroll through the programs because my touchpad does not have a
built-in side scroller.

All was fine with Ubuntu 18.04

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: ubuntu-release-upgrader-core 1:19.04.16.1
ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Apr 24 12:51:20 2019
InstallationDate: Installed on 2018-06-12 (315 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180425.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to disco on 2019-04-20 (3 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug disco dist-upgrade

** Attachment added: "Screenshot from 2019-04-24 12-58-39.png"
   https://bugs.launchpad.net/bugs/1826196/+attachment/5258562/+files/Screenshot%20from%202019-04-24%2012-58-39.png

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https://bugs.launchpad.net/bugs/1826196

Title:
  The Dock cannot scroll without a mouse when multiple programs are open

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  This only happened after upgrading to 19.04.

  Everything works fine if i attach a mouse to my laptop. But without it
  i cannot scroll through the programs because my touchpad does not have
  a built-in side scroller.

  All was fine with Ubuntu 18.04

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: ubuntu-release-upgrader-core 1:19.04.16.1
  ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
  Uname: Linux 5.0.0-13-generic x86_64
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 24 12:51:20 2019
  InstallationDate: Installed on 2018-06-12 (315 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180425.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: Upgraded to disco on 2019-04-20 (3 days ago)
  VarLogDistupgradeTermlog:

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