Clean up the themed controls when unmounted #1172
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Description of Changes
Clean up ref when themed controls are unmounted
Notes & Questions About Changes
I kept seeing an error that 'cannot update unmounted root' from dev environment of Next instance. I think it is because our themed control doesn't clean up its ref when unmounted. (It happens when I revisit the page while navigating - does not happen on the first landing.)
But I do have some questions 🤔