[Merge] lp:~nick-dedekind/qtubuntu/1623861.window-focus into lp:qtubuntu

[Nick Dedekind]

> Please either rebase on top of lp:~gerboland/qtubuntu/stricter-enums or remove
> the fix you did in the debug message of
> UbuntuWindow::handleSurfaceVisibilityChanged (the other branch as a better fix
> for that message).
> 
> Otherwise they will conflict.

removed changed.
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https://code.launchpad.net/~nick-dedekind/qtubuntu/1623861.window-focus/+merge/306318
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