Function link

static/js/transport.js:407–410

(src, dst)

  // no-op), so no reentrancy guard / rAF is needed — that frame-delayed guard
  // was what made inertial scrolling stutter (#163).
  const link = (src, dst) =>
    src.addEventListener("scroll", () => {
      if (dst.scrollTop !== src.scrollTop) dst.scrollTop = src.scrollTop;
    }, { passive: true });
  link(mixer, waveScroll);
  link(waveScroll, mixer);
}