Function scrollDown

src/utils.ts:668–678

()

    return new Promise((resolve) => {
      function scrollDown() {
        window.scrollBy(0, scrollStep);

        if (document.body.scrollHeight - bottomPos() < bottomThreshold) {
          window.scrollTo(0, 0);
          setTimeout(resolve, 500);
          return;
        }

        setTimeout(scrollDown, scrollInterval);
      }

      scrollDown();
    });