[Merge] lp:~sam-sgrs/qtubuntu/qtubuntu-fix-1504776 into lp:qtubuntu

[Sam Segers]

Sam Segers has proposed merging lp:~sam-sgrs/qtubuntu/qtubuntu-fix-1504776 into lp:qtubuntu.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)
Related bugs:
  Bug #1504776 in qtubuntu: "Uses depricated QEvent::ApplicationActivate"
  https://bugs.launchpad.net/qtubuntu/+bug/1504776

For more details, see:
https://code.launchpad.net/~sam-sgrs/qtubuntu/qtubuntu-fix-1504776/+merge/276339

An app has no way to tell that it's getting suspended. Qt has a Qt::ApplicationSuspended flag for that. It's already implemented on iOS, Android and windowsRT.
We also use 'QCoreApplication::postEvent(QCoreApplication::instance(), new QEvent(QEvent::ApplicationActivate));' to indicate changes, but should use QWindowSystemInterface::handleApplicationStateChanged here instead.

My askUbuntu question is very related:
http://askubuntu.com/questions/382170/how-to-tell-if-an-app-is-going-to-get-suspended-from-qml

It seems more people are seem to need something like this.

I haven't tested the change. It's just a first proposal.
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~sam-sgrs/qtubuntu/qtubuntu-fix-1504776 into lp:qtubuntu.
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