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Improve handling of disconnected nodes in MutationObserver #46157

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Summary:
Changelog: [internal]

This improves the handling of disconnected nodes in MutationObserver. Specifically:

  • When observing a node, if the node is disconnected (unmounted) this is just a no-op (without logging errors). We can't observe an unmounted node.
  • When disconnecting the observer, if the observed nodes are disconnected, we get the target shadow node from an internal map, which we always have access to if we successfully started observing the node. If this logs an error now, it's something to look into but it won't generally log it if the target is just disconnected. That will work correctly.

Differential Revision: D61655856

Summary:
Changelog: [internal]

This improves the handling of disconnected nodes in `MutationObserver`. Specifically:
* When observing a node, if the node is disconnected (unmounted) this is just a no-op (without logging errors). We can't observe an unmounted node.
* When disconnecting the observer, if the observed nodes are disconnected, we get the target shadow node from an internal map, which we always have access to if we successfully started observing the node. If this logs an error now, it's something to look into but it won't generally log it if the target is just disconnected. That will work correctly.

Differential Revision: D61655856
@facebook-github-bot facebook-github-bot added CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. p: Facebook Partner: Facebook Partner labels Aug 22, 2024
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This pull request was exported from Phabricator. Differential Revision: D61655856

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This pull request has been merged in 5fc2bd4.

@facebook-github-bot facebook-github-bot added the Merged This PR has been merged. label Aug 22, 2024
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This pull request was successfully merged by @rubennorte in 5fc2bd4

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