whereContainer method
Creates a WidgetSelector that finds all Semantics where container matches the condition.
Example usage:
spot<Semantics>().whereContainer((it) => it.isTrue()).existsOnce();
Implementation
@useResult
WidgetSelector<Semantics> whereContainer(MatchProp<bool> match) {
return withDiagnosticProp<bool>('container', match);
}