dillon1000/react

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Fixed descrepancy between host and class component refs (#12178)

When a ref is removed from a class component, React now calls the previous ref-setter (if there was one) with null. Previously this was the case only for host component refs.

A new test has been added.
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Brian Vaughn authored d529d2035e3fe741acdf1f01619326588fcca697 Parent 4a20ff2
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M packages/react-dom/src/__tests__/refs-destruction-test.js ModifiedM packages/react-reconciler/src/ReactFiberBeginWork.js Modified
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