Don't handleScroll after component has unmounted #1
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`handleScroll` is throttled by 200ms, so it's often the case that the listener gets fired after the component has already unmounted and removed the listener. Adding this guard clause protects against this.
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handleScrollis throttled by 200ms, so it's often the case that the listener gets fired after the component has already unmounted and removed the listener. Adding this guard clause protects against this.