Cannot open "Show Applications" with a touchscreen

[Jean-Baptiste Lallement]

Test Case:
On a laptop with a touchscreen, login and tap the "Show Applications" button at the bottom of the dock to open the list of applications.

Actual result
The list of applications opens and closes immediately because you actually have to hold you finger down to keep it open and as soon as you release it closes

Expected Result
The user tap the "Show applications" button in the dock and the list of applications shows up. It's difficult to have to hold a function to keep it open on a touch screen because you only have 2 hands and it keeps one busy just to keep the thing open then you have to use the other one to select the action you want to perform. note that sometimes the list of applications stays opened but it is not clear which action keeps it open (Long hold maybe?)

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gnome-shell 3.30.1-2ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-8.9-generic 4.18.7
Uname: Linux 4.18.0-8-generic x86_64
ApportVersion: 2.20.10-0ubuntu11
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 11 15:19:43 2018
DisplayManager: gdm3
GsettingsChanges: b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
InstallationDate: Installed on 2018-10-11 (0 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Beta amd64 (20181011)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

the report is a duplicate of bug #1725384