[Merge] lp:~dandrader/qtubuntu/useApplicationStateAPI into lp:qtubuntu

[Daniel d'Andrada]

The proposal to merge lp:~dandrader/qtubuntu/useApplicationStateAPI into lp:qtubuntu has been updated.

Commit Message changed to:

Implement support for application state

Adapted code contribution from Sam Segers.

Also brought QWindowSystemInterface::handleWindowActivated() calls together, so they are all made from the same part of the code to ease tracking.

For more details, see:
https://code.launchpad.net/~dandrader/qtubuntu/useApplicationStateAPI/+merge/277720
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Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~dandrader/qtubuntu/useApplicationStateAPI into lp:qtubuntu.