Show the hidden spinner.

def show(self):
        """Show the hidden spinner."""
        thr_is_alive = self._spin_thread and self._spin_thread.is_alive()

        if thr_is_alive and self._hide_spin.is_set():
            # clear the hidden spinner flag
            self._hide_spin.clear()

            # clear the current line so the spinner is not appended to it
            sys.stdout.write("\r")
            self._clear_line()