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a1aa0f8afd
When the first two elements in a scrollspy content block have a document offset of zero (i.e. they're hard against the top of the page), Scrollspy would switch between them on every scroll event. This could happen, for example, in a system of nested sections: ``` <section id="animals"> <section id="dogs"> Content </section> </section> ``` This ocurred because Scrollspy's check to see if it's at the end of the array of sections uses `!arr[index]`. This misses the case where `arr[index]` does exist and is zero. This commit explicitly checks the array bounds.