dillon1000/react

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Fixes bug when initial mount of a host component is `hidden` (#12294)

`oldProps` was null. This went uncaught by the unit tests because
ReactNoop did not use `oldProps` in either `prepareUpdate` or
`completeUpdate`. I added some invariants so we don't regress in
the future.
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Andrew Clark authored 8e5f12ca6c18fb48ea71cba6bfa9bd7cf499ccb6 Parent 2f5eacc
Changed paths3 files
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M packages/react-noop-renderer/src/ReactNoop.js ModifiedM packages/react-reconciler/src/ReactFiberBeginWork.js ModifiedM packages/react-reconciler/src/__tests__/ReactIncrementalSideEffects-test.internal.js Modified
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