CalculatorGButton constructor Null safety
Implementation
CalculatorGButton(
    ButtonFactory factory,
    String uText,
    String fText,
    String gText,
    Operation uKey,
    Operation fKey,
    Operation gKey,
    String rawKeyboardKey,
    {required this.extraAcceleratorName,
    String? acceleratorLabel,
    Key? key})
    : super(factory, uText, fText, gText, uKey, fKey, gKey, rawKeyboardKey,
          acceleratorLabel: acceleratorLabel, key: key);