827b6c99ae
Intersection observer callback can be called after the component gets destroyed:
```
Assertion Failed: calling set on destroyed object: <@ember/component:ember6019>.docked = false
at assert (ember:37774:17)
at _set2 (ember:17304:46)
at Class.set (ember:29529:29)
at Class._intersectionHandler (discourse/app/components/topic-progress:135:16)
at Backburner._run (ember:56389:25)
at Backburner._join (ember:56365:21)
at Backburner.join (ember:56082:19)
at join (ember:42874:28)
at IntersectionObserver.eval (ember:42978:19)
```
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| config | ||
| lib | ||
| public/assets/scripts | ||
| tests | ||
| .ember-cli | ||
| .npmrc | ||
| ember-cli-build.js | ||
| package.json | ||
| testem.js | ||