merge method
Creates a new TModel where each properties from this object has been merged with the matching properties from the other object.
For example:
var myModel3 = myModel1.merge(myModel2);
Implementation
@override
FastThemeBlocState merge(covariant FastThemeBlocState state) {
return copyWith(
brightness: state.brightness,
themeMode: state.themeMode,
);
}