[Merge] lp:~saviq/qtubuntu/revert-application.active into lp:qtubuntu

[Daniel d'Andrada]

> I think the fix should be as simple as not deleting the code that the original
> MP removed, instead of reverting everything.

Hmmm, actually the problem is not that as we don't have to send the deprecated events since Qt feeds the deprecated API from the new one.

It's about a behavioral change really, as that new code is more accurate but it maybe hit some bug, like after unlock the foreground app doesn't have focus or something. investigating.
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https://code.launchpad.net/~saviq/qtubuntu/revert-application.active/+merge/281253
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