[Merge] lp:~dandrader/qtubuntu/busySwap-lp1473720 into lp:qtubuntu

[Gerry Boland]

Review: Needs Fixing

Testing with a simple qml file with mir_proving_server, when making the window larger, I see white borders while qt tries to catch up with the surface size. 

This is a visual regression, there must be a better way.
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https://code.launchpad.net/~dandrader/qtubuntu/busySwap-lp1473720/+merge/264761
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