merge method
Implementation
ZeroButtonIconStyleSet merge(ZeroButtonIconStyleSet? other) {
if (other == null) return this;
return copyWith(
primaryStyle:
primaryStyle?.merge(other.primaryStyle) ?? other.primaryStyle,
secondaryStyle:
secondaryStyle?.merge(other.secondaryStyle) ?? other.secondaryStyle,
largeSize: other.largeSize,
mediumSize: other.mediumSize,
smallSize: other.smallSize,
disabledColor: other.disabledColor,
);
}