software updater panel does not appear on <Alt><Tab>

[Humphrey van Polanen Petel]

the software updater panel that informs the user that the update procedure has completed (see attached) does not show when cycling through running processes with <Alt><Tab>

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: update-manager 1:16.04.3
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Aug 11 10:11:25 2016
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'window-width' b'484'
 b'com.ubuntu.update-manager' b'launch-time' b'1470866233'
InstallationDate: Installed on 2015-09-08 (337 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
InterpreterPath: /usr/bin/python3.5
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: Upgraded to xenial on 2016-08-05 (5 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Bruno Nova (brunonova)]

This happens every time update-manager is started automatically (updates available, updates installed, need to reboot, etc.).

The Unity launcher displays an ">" indicator for update-manager, instead of a filled triangle, wrongly thinking it's in another workspace.