Item entry scrolls down even when adding a duplicate item

[Spacerat]

  const onSubmit: React.FormEventHandler<HTMLFormElement> = React.useCallback(
    (e) => {
      e.preventDefault();
      if (value.length > 0) {
        onAddItems([value]);
        setValue("");
        textRef.current?.focus();
        // HACK: keep the bottom of the list in view.
        // scrollIntoView doesn't seem to work well for this on mobile.
        // Is there a better way?
        if (keepInView) setTimeout(() => window.scrollBy(0, 52), 1);
      }
    },
    [onAddItems, value, keepInView]
  );

onAddItems might not add anything if the item already exists, but we still scroll down.