merge method
Implementation
ZeroButtonGroupStyleSet merge(ZeroButtonGroupStyleSet? other) {
if (other == null) return this;
return copyWith(
filled: filled?.merge(other.filled) ?? other.filled,
outlined: outlined?.merge(other.outlined) ?? other.outlined,
text: text?.merge(other.text) ?? other.text,
underline: underline?.merge(other.underline) ?? other.underline,
);
}