private TextWithMnemonic createTextWithMnemonic() {
    String text = getText();
    if (Strings.isEmpty(text)) return TextWithMnemonic.EMPTY;
    TextWithMnemonic mnemonic = TextWithMnemonic.fromMnemonicText(text, false);
    if (mnemonic != null) return mnemonic;
    // assume that it is already set
    int index = getMnemonicIndex();
    return 0 <= index && index < text.length()
           ? TextWithMnemonic.fromPlainTextWithIndex(text, index)
           : TextWithMnemonic.fromPlainText(text, (char)getMnemonicCode());
  }
private TextWithMnemonic createTextWithMnemonic()