Component reuse causes focus to appear in the input of a component that user never clicked

Hi! :smile:

## Steps to reproduce

1. Open https://lolmaus.github.io/ember-example/#/50000
2. Put focus into an input
3. Scroll slowly
4. See the focused input leave the viewport
5. Keep scrolling slowly

## What should happen

Should never see a focused input again while scrolling in the same direction.

## What actually happens

Shortly after the focused input disappears at the top of the viewport, it reemerges from the bottom.

## Notes

Not a big deal, but still.

Example source: https://github.com/lolmaus/ember-example