user32/tests: SetWindowPos() propagates update region from WS_CLIPCHILDREN child to its children (try 3).

[Sergey Guralnik]

This patch demonstrates the most interest case from previous versions.
When SetWindowPos() moves child window, that has some invalid
area, it also invalidates children of this window according to its
update region, even if moved window has WS_CLIPCHILDREN style.

Wine doesn't perform this invalidation.
One pretty large application depends on this feature, and now,
runned under Wine, it has broken output.

Hope this variant is more clear than all previous.

-- 
Sergey
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