merge method
Implementation
InfoBarThemeData merge(InfoBarThemeData? style) {
if (style == null) return this;
return InfoBarThemeData(
closeIcon: style.closeIcon ?? closeIcon,
icon: style.icon ?? icon,
decoration: style.decoration ?? decoration,
actionStyle: style.actionStyle ?? actionStyle,
iconColor: style.iconColor ?? iconColor,
padding: style.padding ?? padding,
);
}