[pull] main from facebook:main #368
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This is an alternative to #35059. If the name needs escaping, then instead of escaping it, we just use a base64 name. This wouldn't allow you to match on an escaped name in your own CSS like you should be able to if browsers worked properly. But at least it would provide matching name in current browsers which is probably sufficient if you're using auto-generated names. This also covers some cases where `CSS.escape()` isn't sufficient anyway like when the name ends in a dot.
…35063) Also, don't not skip hidden trees. Memoized state is null when an Offscreen boundary (Suspense or Activity) is visible. This logic was inversed in a couple of View Transition checks which caused pairs to be discovered or not discovered incorrectly for insertion and deletion of Suspense or Activity boundaries.
We already append `randomKey` to each handle name to prevent external libraries from accessing and relying on these internals. But more libraries recently have been getting around this by simply iterating over the element properties and using a `startsWith` check. This flag allows us to experiment with moving these handles to an internal map. This PR starts with the two most common internals, the props object and the fiber. We can consider moving additional properties such as the container root and others depending on perf results.
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