server: Correctly expose composited parent window and its child on position change.
Skip redrawing the composited child window when the window rect and
visible region stays the same, since we're taking the union of the old
and new visible regions.
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53153Signed-off-by: Jinoh Kang <jinoh.kang.kr@gmail.com>
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