[pull] main from react:main - #651
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Co-authored-by: Sebastian "Sebbie" Silbermann <sebastian.silbermann@vercel.com>
) Fragment IntersectionObserver targets used to stay observed after a child was removed so the exit record (isIntersecting: false) could still fire, but that left the observer holding detached nodes. We now unobserve ResizeObserver targets immediately, and delay IntersectionObserver unobserve until after paint so the exit still lands, then drop the strong ref. If the same node is reinserted before that flush, we cancel the pending unobserve so a later cleanup does not detach a child that’s still visible. Closes #37452 Closes #37302 Fixes #37451
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