attachTemplatePortal method
Implementation
@override
Future<Map<String, dynamic>> attachTemplatePortal(TemplatePortal portal) {
final viewRef = _viewContainerRef.createEmbeddedView(portal.template);
portal.locals.forEach(viewRef.setLocal);
setPortalDisposer(_viewContainerRef.clear);
return Future.value(BasePortalHost.createLocalsMap(viewRef));
}