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fix view clipping to operate on ui hierachy
Summary: There was a bug in the view clipping logic. Clipping works on uiview hierarchy, but I've been using `reactSuperview` to get clipping rect for my parent. This is incorrect in a case where these two hierarchies don't match and there are some views between a view and its `reactSuperview`. So we should really use normal `superview`. A minor complication is that `superview` is `nil` if we are clipped. We could remember what our last `superview` was, but that's extra data we have to manage. Instead I use one clever trick to avoid doing so. (Let me know if it makes sense based on my inline documentation.) Reviewed By: mmmulani Differential Revision: D4182647 fbshipit-source-id: 779cbcec0bd08eb270c3727c9c5cb9c080c4a2a4
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