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Jimmy LaiandGitHub 17e44d2907 app-router: add batching support for RSC router payloads (#48253)
This PR basically adds support for processing multiple router payloads.
Previously we were only handling one payload at a time but now that we
introduced parallel routes, we need to be able to render and return
separate parts of the layout separately.

Before, the single payload was generated in a DFS manner: we traversed
the router state and rendered the first segment of the tree that we
found needed rendering. In practice, this meant that we could miss
adjacent segments that might need to be re-rendered as well.

Now, we iterate all branches of the tree and return an array of flight
patches to be applied on the client correctly.

fixes NEXT-971

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2023-04-12 09:53:13 +02:00
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