Code review comment for lp:~mzanetti/unity8/dash-as-app

$ make tryShell
1 - launch an app from the launcher
2 - tap on it
<vkb shows up>
3 - do a left edge drag

expected result:
vkb should go away as soon as the app window starts moving righwards.
Just like when you start a right-edge gesture.

actual result:
vkb goes away only once you finish the gesture

vkb going away means the MirSurfaceItem losing focus which on its turn means the SpreadDelegate.interactive going false.