updateFrom method
Receives the next component instance when Flint preserves this instance.
Override this in stateful components that also accept constructor values. Flint keeps the existing instance so local state survives, then gives it the newly-created component so props-like fields can be copied in.
Implementation
@override
void updateFrom(covariant HtmlContent next) {
html = next.html;
id = next.id;
selector = next.selector;
className = next.className;
dartStyle = next.dartStyle;
props = next.props;
trusted = next.trusted;
}