Bounces back when it fling or drag to the bottom

[EchoDongYu]

There is something wrong with the flingBehavior when use in Dialog or ModalBottomSheet，It will bounces back when it fling or drag to the bottom

[EchoDongYu]

问题在于 onScrollFinished 中的 snappedIndex 可能会越界，如下替换可解决问题

  val newDayOfMonth =
      if (snappedIndex >= dayOfMonths.size) dayOfMonths.last().value
      else dayOfMonths.find { it.index == snappedIndex }?.value