merge method

Implementation

SingleSelectStyle merge(SingleSelectStyle mergeWith) {
  return SingleSelectStyle(
    labelStyle: labelStyle ?? mergeWith.labelStyle,
    selectedOptionTextStyle:
        selectedOptionTextStyle ?? mergeWith.selectedOptionTextStyle,
    optionTextStyle: optionTextStyle ?? mergeWith.optionTextStyle,
    selectedOptionBackground:
        selectedOptionBackground ?? mergeWith.selectedOptionBackground,
    optionBackground: optionBackground ?? mergeWith.optionBackground,
    width: width ?? mergeWith.width,
    height: height ?? mergeWith.height,
    background: background ?? mergeWith.background,
    border: border ?? mergeWith.border,
    borderRadius: borderRadius ?? mergeWith.borderRadius,
    gradient: gradient ?? mergeWith.gradient,
  );
}