Ensure content was observed before unobserving. Fixes #5524

Polymer / polymer

Our original Web Component library.

https://polymer-library.polymer-project.org/

BSD 3-Clause "New" or "Revised" License

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Closed kevinpschaaf closed 5 years ago

kevinpschaaf commented 5 years ago

Since child nodes are observed async, if the node is unobserved before the debouncer runs, child nodes may not have been observed yet.

Fixes #5524