Function markAuto

packages/ui/src/hooks/create-auto-scroll.tsx:41–52

(el: HTMLElement)

  // the handler can see a non-zero `distanceFromBottom` and incorrectly assume
  // the user scrolled.
  const markAuto = (el: HTMLElement) => {
    auto = {
      top: Math.max(0, el.scrollHeight - el.clientHeight),
      time: Date.now(),
    }

    if (autoTimer) clearTimeout(autoTimer)
    autoTimer = setTimeout(() => {
      auto = undefined
      autoTimer = undefined
    }, 1500)
  }

  const isAuto = (el: HTMLElement) => {
    const a = auto