Simplify isIntersecting in status_list.js #3371
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This has the same functionality as before, but removes some unnecessary object allocations and adds a comment explaining what's going on.
Essentially the point of the array was to force the component to resolve
shouldComponentUpdate()to true whenever theisIntersectingmap changed (because a new array was created). But we can do this more directly by just incrementing an integer, and then there's no need for an extra array.