[Merge] lp:~nick-dedekind/qtubuntu/lp1475678.surface-occlude into lp:qtubuntu

[Daniel d'Andrada]

Review: Needs Fixing

something like pendingOcclusion or occlusionCatchup would be clearer than exposeCatchUp as this is meant specifically to occlude the window. Corner cases like this should be well explained.
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https://code.launchpad.net/~nick-dedekind/qtubuntu/lp1475678.surface-occlude/+merge/273424
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