[two_dimensional_scrollables] Activate leak testing and fix memory leaks

packages/two_dimensional_scrollables/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.5.2
+
+* Fixes memory leaks.
+
 ## 0.5.1
 
 * Fixes an infinite loop of onExit/onEnter events when setState is called within onEnter in a TableSpan.

packages/two_dimensional_scrollables/example/lib/table_view/simple_table.dart

@@ -51,6 +51,7 @@ class _TableExampleState extends State<TableExample> {
                 ),
               )
             : TableView.builder(
+                key: ValueKey(_selectionMode),
                 verticalDetails: ScrollableDetails.vertical(
                   controller: _verticalController,
                 ),

packages/two_dimensional_scrollables/example/pubspec.yaml

@@ -1,6 +1,6 @@
 name: two_dimensional_examples
-description: 'A sample application that uses TableView and TreeView'
-publish_to: 'none'
+description: "A sample application that uses TableView and TreeView"
+publish_to: "none"
 
 # The following defines the version and build number for your application.
 version: 2.0.0
@@ -18,6 +18,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  leak_tracker_flutter_testing: any
 
 # The following section is specific to Flutter packages.
 flutter:

packages/two_dimensional_scrollables/example/test/flutter_test_config.dart

@@ -0,0 +1,13 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
+
+Future<void> testExecutable(FutureOr<void> Function() testMain) async {
+  LeakTesting.enable();
+  LeakTracking.warnForUnsupportedPlatforms = false;
+  await testMain();
+}