Function ref

packages/app-core/src/components/EditorSelectionToolbar.tsx:204–209

()

  // Assigns the next roving-order ref index as each control renders.
  let idx = 0
  const ref = (): ((el: HTMLButtonElement | null) => void) => {
    const at = idx++
    return (el) => {
      itemRefs.current[at] = el
    }
  }

  return (
    <div