in addition to testing the test case in bug 883708 doesn't assert we should test proper events are fired and no extra events are fired. So tree is created then new accessible parent created -> one show event no hide event or extra show event. tree exists and new accessible parent introduced -> hide event then show I guess? (this might be still broken) In both cases we should check accessible tree is as expected after mutation.
Whiteboard: [email@example.com][lang=js] → [lang=js]
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