anchor.diff:      if (errorText != null) {
         return Text(errorText);
       } else if (isLoading) {
  -      return Center(child: CircularProgressIndicator());
  +      return CircularProgressIndicator();
       } else {
         return child;
       }
  
positive.code:     if (!hidden) {
        return Card(
          child: Column(
            children: <Widget>[
              ListTile(
                title: title,
  
negative.code:               ),
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [buildBody()],
              ),
              actionButtons != null
  