[pull] main from facebook:main #97
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) We have many cases internally where the `containerInstance` resolves to a comment node. `restoreRootViewTransitionName` is called when `enableViewTransition` is on, even without introducing a `<ViewTransition />`. So that means it can crash pages because `containerInstance.style` is `undefined` just by turning on the flag. This skips cancel/restore of root view transition name if a comment node is the root.
There's an interesting case when a SuspenseList is partially prerendered but some of the completed boundaries are blocked by rows to be resumed. This handles it but just unblocking the future rows to avoid stalling. However, the correct semantics will need special handling in the postponed state.
When a new child of a fragment instance is inserted, we need to notify the instance to keep any relevant tracking up to date. For example, we automatically observe the new child with any active IntersectionObserver. For mutable renderers (DOM), we reuse the existing traversal in `commitPlacement` that does the insertions for HostComponents. Immutable renderers (Fabric) exit this path before the traversal though, so currently we can't notify the fragment instances. Here I've created a separate traversal in `commitPlacement`, specifically for immutable renders when `enableFragmentRefs` is on.
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