dillon1000/react

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Do not fire getDerivedStateFromProps unless props or state have changed (#12802)

Fixes an oversight from #12600. getDerivedStateFromProps should fire
if either props *or* state have changed, but not if *neither* have
changed. This prevents a parent from re-rendering if a deep child
receives an update.
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Andrew Clark authored c5d3104fc0958027820972f3416ec572ded89f28 Parent 0ba63aa
Changed paths2 files
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M packages/react-reconciler/src/ReactFiberClassComponent.js ModifiedM packages/react-reconciler/src/__tests__/ReactIncremental-test.internal.js Modified
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