Function tick

web/components/HashScroller.tsx:162–181

()

  const maxFrames = 40; // 约 650ms 兜底

  const tick = () => {
    totalFrames += 1;
    if (totalFrames > maxFrames) {
      onTimeout?.();
      callback();
      return;
    }
    const h = measure();
    if (h === last) {
      stableFrames += 1;
      if (stableFrames >= 3) {
        callback();
        return;
      }
    } else {
      last = h;
      stableFrames = 0;
    }
    requestAnimationFrame(tick);
  };
  requestAnimationFrame(tick);
}