merge method

Implementation

RadioButtonElementStyle merge(RadioButtonElementStyle mergeWith) {
  return RadioButtonElementStyle(
    optionTextStyle: optionTextStyle ?? mergeWith.optionTextStyle,
    labelStyle: labelStyle ?? mergeWith.labelStyle,
    activeColor: activeColor ?? mergeWith.activeColor,
    width: width ?? mergeWith.width,
    height: height ?? mergeWith.height,
    background: background ?? mergeWith.background,
    border: border ?? mergeWith.border,
    borderRadius: borderRadius ?? mergeWith.borderRadius,
    gradient: gradient ?? mergeWith.gradient,
    radioColor: radioColor ?? mergeWith.radioColor,
  );
}