Window titlebar and shadow flickers when scrubbing through menus (or when a tooltip appears)

[Daniel van Vugt]

Application titlebar and shadow flickers when scrubbing through menus, or when a tooltip appears.

Test case:
  1. $ sol -- --desktop_file_hint=unity8
  2. Click on a menu and move the mouse horizontally to the next menu.

Expected: No change in the app window's title bar or shadow.
Observed: Flickering in the app title bar and shadow on every menu change.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: unity8 8.15+17.04.20170206-0ubuntu1
ProcVersionSignature: Ubuntu 4.9.0-15.16-generic 4.9.5
Uname: Linux 4.9.0-15-generic x86_64
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
Date: Wed Feb 8 09:55:14 2017
InstallationDate: Installed on 2016-11-03 (97 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Alpha amd64 (20161102)
SourcePackage: unity8
UpgradeStatus: No upgrade log present (probably fresh install)
upstart.unity8-dash.log: [2017-02-08:09:55:07.500] "clickscope" : setActive: true

*NOTE*: similar cause, but different usecase to lp:1625846

[Launchpad Janitor (janitor)]

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

[Daniel van Vugt (vanvugt)]

Looks like this is similar to bug 1625846.

Mir lacks a client API allowing clients to flag that certain surfaces (of the app's choice, not defined by the surface type) should not receive focus and thus should never take focus away from the app window.

[Alan Griffiths (alan-griffiths)]

Agreed, this is the same underlying issue with "focus-loss" events that manifests in lp:1625846. We should ensure that any plan to resolve addresses both usecases.

[Michał Sawicz (saviq)]

Syncing task from Mir.