Ryan Zhu

https://github.com/bvaughn/react-virtualized/blob/9913953d5ebfd2caedadefea2f3b53978b6eb567/source/ArrowKeyStepper/ArrowKeyStepper.js#L67 this is where the issue locates. When you scroll, it changes the `scrollToRow` in the state but it reset the value from prop.