private @Nullable UnscrambleSupport getSavedUnscrambler() {
    final String savedUnscramblerName = getPropertyValue(PROPERTY_UNSCRAMBLER_NAME_USED);
    UnscrambleSupport selectedUnscrambler = null;
    for (UnscrambleSupport unscrambleSupport : UnscrambleSupport.EP_NAME.getExtensionList()) {
      if (Comparing.strEqual(unscrambleSupport.getPresentableName(), savedUnscramblerName)) {
        selectedUnscrambler = unscrambleSupport;
      }
    }
    return selectedUnscrambler;
  }
private @Nullable UnscrambleSupport getSavedUnscrambler()