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* Helper method to invalidate portions of a standard container frame if the
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* background and outline).
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* We assume that the difference between the old frame area and the new
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* frame area is invalidated by some other means.
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* @param aDesiredSize the new size of the frame
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// Helper function that tests if the frame tree is too deep; if it
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// is it marks the frame as "unflowable" and zeros out the metrics