Function tick

demo/chat/App.tsx:251–261

()

    }
    let raf = 0;
    const tick = () => {
      const el = msgsRef.current;
      if (el) {
        tickStreamScrollFollow(el, msgsScrollFollowRef.current);
      }
      const bts = btsRef.current;
      if (bts) {
        tickStreamScrollFollow(bts, btsScrollFollowRef.current);
      }
      raf = requestAnimationFrame(tick);
    };
    raf = requestAnimationFrame(tick);
    return () => cancelAnimationFrame(raf);
  }, [streaming]);