dillon1000/react

Bugfix: Render phase update causes remaining updates in same component to be dropped (#18537)

* Bugfix: Render phase update leads to dropped work

Render phase updates should not affect the `fiber.expirationTime` field.
We don't have to set anything on the fiber because we're going to
process the render phase update immediately.

We also shouldn't reset the `expirationTime` field in between render
passes because it represents the remaining work left in the update
queues. During the re-render, the updates that were skipped in the
original pass are not processed again.

I think my original motivation for using this field for render phase
updates was so I didn't have to add another module level variable.

* Add repro case for #18486

Co-authored-by: Dan Abramov <[email protected]>