whereController method
Creates a WidgetSelector that finds all GridView where controller matches the condition.
Example usage:
spot<GridView>().whereController((it) => it.equals(ScrollController())).existsOnce();
Implementation
@useResult
WidgetSelector<GridView> whereController(MatchProp<ScrollController> match) {
return withDiagnosticProp<ScrollController>('controller', match);
}