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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| .. | ||
| adapters | ||
| components | ||
| controllers | ||
| helpers | ||
| initializers | ||
| lib | ||
| mixins | ||
| models | ||
| pre-initializers | ||
| raw-views | ||
| routes | ||
| services | ||
| styles | ||
| templates | ||
| widgets | ||
| app.js | ||
| index.html | ||
| mapping-router.js | ||