Hover-Scroll to Switch Between Multiple Windows of a Launcher

In Ubuntu Unity, you could hover over a launcher-icon and scroll through all of the windows open for that application. Scrolling wouldn't showcase thumbnails; instead it would actually focus each different window as you would scroll.

In Ubuntu 18.04, the GNOME taskbar does indeed offer a nice looking thumbnail list of windows when you click on the launcher of an application that has multiple windows.

However, I'm requesting that the same hover-scroll feature offered by the Unity Desktop be added too. This request would have no barring on the existing behavior, because currently hover-scroll does nothing. This methodology requires "zero-clicks and less mouse travel" to cycle through all the open windows of a particular application.

Therefore, I'm ok with the fact that clicking the launcher does what it currently does.

This hover-scroll feature request can be added without effecting the existing click event behavior.

No one who doesn't like the feature wouldn't have to endure it, and people who expect it will love it. Win:Win

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-core (not installed)
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.9-0ubuntu2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Mar 30 14:53:26 2018
InstallationDate: Installed on 2018-02-09 (49 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: meta-gnome3
UpgradeStatus: Upgraded to bionic on 2018-03-28 (2 days ago)