A couple of composite fixes from Owen Taylor

[Keith Packard]

Owen Taylor has been poking at Composite for a while now and has helped
uncover a couple of interesting corner cases. Here are two patches, the
first is a correctness patch which fixes parent clip recomputation when
windows move from automatic to manual redirection. The second is an
optimization to eliminate descendent exposures on parent resize.

-- 
keith.packard at intel.com
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