swithching workspace by scrolling on edge of Dock (left side bar)

[Stefan Gräber]

If you position the mouse corsor on the edge of Dock and scroll, you can switch the workspace, which behaves equivalent to the scrolling on the "Show Applications" button in the corner.

I've reproduced it on other Ubuntu 18 installations of friends (all 3 I tested, at least one was a fresh installation from the official iso).

It is not important where Dock is or whether a window or the desktop is next to it. Program shortcuts have also no effect, because they end before it.
It works with a single or 2 monitors on all instances of Dock.

I use Ubuntu 18.04.1 LTS with all updates (via apt upgrade) installed and observed it for several months now. (After starting apport for this I updated again and nothing changed, no restart)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sat Feb 2 16:10:48 2019
DistUpgraded: 2018-10-01 14:59:21,229 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: CLEVO/KAPOK Computer 4th Gen Core Processor Integrated Graphics Controller [1558:2300]
   Subsystem: CLEVO/KAPOK Computer GM107M [GeForce GTX 860M] [1558:2300]
InstallationDate: Installed on 2017-03-18 (685 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
MachineType: Notebook W230SS
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic root=UUID=907d4e48-c148-454e-aa8a-7adb74d51fb2 ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to bionic on 2018-10-01 (124 days ago)
dmi.bios.date: 04/15/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.5
dmi.board.asset.tag: Tag 12345
dmi.board.name: W230SS
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/15/2014:svnNotebook:pnW230SS:pvrNotApplicable:rvnNotebook:rnW230SS:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: W230SS
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.95-1~18.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Mon Oct 1 13:12:45 2018
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
 NOUVEAU(G0): [XvMC] Failed to initialize extension.
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.6-1ubuntu4~16.04.1
xserver.video_driver: modeset

[Sebastien Bacher (seb128)]

Thank you for your bug report, what's the output of the command?
- dpkg -l | grep dock

the bug is similar to bug #1719706 but that was fixed, do you use the ubuntu dock or did you install dash to dock?

[Sebastien Bacher (seb128)]

or do you scroll over the application button?

[Stefan Gräber (schetefan24)]

No I don't have "dash to dock" installed (never heard of it before)
No, I don't scroll on the application button, it is just exactly the same behavior. It works on the complete pixel line at the edge.

The similar bug could be actually the same, if you assume that the dock is a layer of 2 rectangles where the upper one (which contains the program shortcuts) is a bit too small on both sides.
I have really no knowledge about how it is implemented, so it could be sth totally different.

requested output:

ii gnome-shell-extension-ubuntu-dock 0.9.1ubuntu18.04.3 all Ubuntu Dock for GNOME Shell

(I've removed some whitespaces)