Code review comment for lp:~dandrader/unity8/miral

Looking good except this hard to track focus related issue:

https://imgur.com/a/ZcR0A

It can happen when an application is taking a long time to start up, and you close it before it does. At that point, the focus chain is broken and the user is left with no app/window focused at all (as can be seen from the empty window title in the top panel)