[Fiber] Replay onChange Events if input/textarea/select has changed before hydration (#33129)
This fixes a long standing issue that controlled inputs gets out of sync with the browser state if it's changed before we hydrate. This resolves the issue by replaying the change events (click, input and change) if the value has changed by the time we commit the hydration. That way you can reflect the new value in state to bring it in sync. It does this whether controlled or uncontrolled. The idea is that this should be ok to replay because it's similar to the continuous events in that it doesn't replay a sequence but only reflects the current state of the tree. Since this is a breaking change I added it behind `enableHydrationChangeEvent` flag. There is still an additional issue remaining that I intend to address in a follow up. If a `useLayoutEffect` triggers an sync rerender on hydration (always a bad idea) then that can rerender before we have had a chance to replay the change events. If that renders through a input then that input will always override the browser value with the controlled value. Which will reset it before we've had a change to update to the new value.
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Sebastian Markbåge committed
587cb8f8967866139bbfdbae3f519cb37e68a054
Parent: 79586c7
Committed by GitHub <[email protected]>
on 5/6/2025, 4:10:05 AM