Fix tests, doc, example

Author: jt274

packages/firebase_ui_firestore/example/lib/main.dart

@@ -35,7 +35,7 @@ class FirebaseUIFirestoreExample extends StatelessWidget {
         body: FirestoreListView<User>(
           query: collection,
           padding: const EdgeInsets.all(8.0),
-          itemBuilder: (context, snapshot) {
+          itemBuilder: (context, snapshot, index) {
             final user = snapshot.data();
             return Column(
               children: [

packages/firebase_ui_firestore/lib/src/query_builder.dart

@@ -413,7 +413,7 @@ typedef FirestoreEmptyBuilder = Widget Function(BuildContext context);
 /// ```dart
 /// FirestoreListView<Movie>(
 ///   query: moviesCollection.orderBy('title'),
-///   itemBuilder: (context, snapshot) {
+///   itemBuilder: (context, snapshot, index) {
 ///     Movie movie = snapshot.data();
 ///     return Text(movie.title);
 ///   },

tests/integration_test/firebase_ui_firestore/firestore_list_view_test.dart

@@ -3,10 +3,11 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:firebase_ui_firestore/firebase_ui_firestore.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:firebase_ui_firestore/firebase_ui_firestore.dart';
 import 'package:mockito/mockito.dart';
+
 import '../utils.dart';
 
 void main() {
@@ -61,7 +62,8 @@ void main() {
             body: FirestoreListView<Map>(
               query: collection.orderBy('value'),
               loadingBuilder: (context) => const Text('loading...'),
-              itemBuilder: (context, snapshot) => throw UnimplementedError(),
+              itemBuilder: (context, snapshot, index) =>
+                  throw UnimplementedError(),
             ),
           ),
         ),
@@ -84,7 +86,8 @@ void main() {
             home: Scaffold(
               body: FirestoreListView<Map>(
                 query: collection.orderBy('value'),
-                itemBuilder: (context, snapshot) => throw UnimplementedError(),
+                itemBuilder: (context, snapshot, index) =>
+                    throw UnimplementedError(),
               ),
             ),
           ),
@@ -105,7 +108,8 @@ void main() {
             body: FirestoreListView<Map>(
               query: collection,
               cacheExtent: 0,
-              itemBuilder: (context, snapshot) => throw UnimplementedError(),
+              itemBuilder: (context, snapshot, index) =>
+                  throw UnimplementedError(),
             ),
           ),
         ),
@@ -144,7 +148,7 @@ void main() {
                   cacheExtent: 0,
                   pageSize: 5,
                   itemExtent: size,
-                  itemBuilder: (context, snapshot) {
+                  itemBuilder: (context, snapshot, index) {
                     final v = snapshot.data()['value'] as int;
 
                     return Container(
@@ -208,6 +212,7 @@ class ListViewBuilderSpy<T> extends Mock {
   Widget call(
     BuildContext? context,
     T? snapshot,
+    int? index,
   ) {
     return super.noSuchMethod(
       Invocation.method(#call, [context, snapshot]),