[Merge] lp:~loic.molinari/qtubuntu/qtubuntu-requested-surface-format-fix into lp:qtubuntu

[Gerry Boland]

+ const int requestedSwapInterval = surface->format().swapInterval();
Think there'd be value in the QTUBUNTU_SWAPINTERVAL env var being re-introduced?
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https://code.launchpad.net/~loic.molinari/qtubuntu/qtubuntu-requested-surface-format-fix/+merge/260273
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