user32: add test cases for update rects affected by ShowWindow

[Clinton Stimpson]

This patch adds a test to check the results of GetUpdateRect when a 
child window is hidden.
See bug #7360.  Wine incorrectly makes an update rect for the 
grandparent window which has a todo_wine around it.

Thanks,
Clinton Stimpson

ChangeLog:
    Add test for GetUpdateRect and ShowWindow interaction.

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