[Mir] Unity8 crashes when an app tries to exit itself

[Omer Akram]

If an app have a 'quite' button i.e. the One that closes the app, tapping that while running Mir crashes Unity8 and one have to restart the phone to get back to a working state.

1. open system settings
2. go to Background panel
3. try to change the wallpaper so that content picker appear
4. tap 'Cancel'

What happens:
Unity crashes.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: libmirplatform 0.0.13+13.10.20131003-0ubuntu1
Uname: Linux 3.4.0-3-mako armv7l
ApportVersion: 2.12.5-0ubuntu1
Architecture: armhf
Date: Fri Oct 4 11:28:17 2013
InstallationDate: Installed on 2013-10-03 (0 days ago)
InstallationMedia: Ubuntu Saucy Salamander (development branch) - armhf (20131003.2)
MarkForUpload: True
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
SourcePackage: mir
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[Gema Gomez (gema)]

It's consistent, I can easily reproduce. It works on SF, though.

[Gema Gomez (gema)]

If you change "4. cancel" with "4. picking a picture" the behaviour is the same, everything goes blank.