The render object of the matching widget in the widget tree.
Throws a StateError if finder is empty or matches more than
one widget (even if they all have the same render object).
- Use firstRenderObject if you expect to match several render objects but only want the first.
- Use renderObjectList if you expect to match several render objects and want all of them.
Source
RenderObject/*=T*/ renderObject/*<T extends RenderObject>*/(Finder finder) {
TestAsyncUtils.guardSync();
return finder.evaluate().single.renderObject;
}