Handle zero-area and display: none cases for v2 release branch #103
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Attempts to satisfy the spec: https://www.w3.org/TR/intersection-observer/#update-intersection-observations-algo
isIntersecting, non-zero area, and display:nonen are all related, so fixing in one swoop.
Fixes:
#93
#73
Related issues:
w3c/IntersectionObserver#69
w3c/IntersectionObserver#222