message: Fix DropdownButton focus on mount
diff: @@ -53,9 +53,13 @@ export const DropdownButton = (props: DropdownButtonProps) => {
  const handleAfterClick = () => setOpen(false)
  + const isFirstRun = React.useRef(true)
  React.useEffect(() => {
  // Skip on first render
  - if (!buttonRef.current) { return }
  + if (isFirstRun.current) {
  + isFirstRun.current = false
  + return
  + }
  if (isOpen) {
  // When opened, focus the first menu item
  