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

[Nick Dedekind]

Review: Disapprove

> 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.

Done and added a comment explaining.
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https://code.launchpad.net/~nick-dedekind/qtubuntu/lp1475678.surface-occlude/+merge/273424
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