dillon1000/react

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[Fresh] Don't traverse remounted trees (#15685)

* Don't traverse children when hot reloading needs a remount

If we're gonna remount that tree anyway, there is no use in traversing its children beforehand.

* Add a test verifying hot reload batches updates

Otherwise there is a risk of it being super slow due to cascades.
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Dan Abramov authored ec38def44f2ff696ec0b73c212265fd2324bcdaf Parent 5731e52
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M packages/react-dom/src/__tests__/ReactFresh-test.internal.js ModifiedM packages/react-reconciler/src/ReactFiberHotReloading.js Modified
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