Fix memory leak in `editable_gesture_test.dart` (#144691)

packages/flutter/test/rendering/editable_gesture_test.dart

@@ -6,23 +6,21 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 void main() {
   final TestWidgetsFlutterBinding binding = _GestureBindingSpy();
 
-  testWidgets('attach and detach correctly handle gesture',
-  // TODO(polina-c): clean up leaks, https://github.com/flutter/flutter/issues/134787
-  experimentalLeakTesting: LeakTesting.settings.withIgnoredAll(),
-  (_) async {
+  testWidgets('attach and detach correctly handle gesture', (_) async {
     expect(WidgetsBinding.instance, binding);
     final TextSelectionDelegate delegate = FakeEditableTextState();
+    final ViewportOffset offset = ViewportOffset.zero();
+    addTearDown(offset.dispose);
     final RenderEditable editable = RenderEditable(
       backgroundCursorColor: Colors.grey,
       selectionColor: Colors.black,
       textDirection: TextDirection.ltr,
       cursorColor: Colors.red,
-      offset: ViewportOffset.zero(),
+      offset: offset,
       textSelectionDelegate: delegate,
       text: const TextSpan(
         text: 'test',
@@ -36,13 +34,17 @@ void main() {
         affinity: TextAffinity.upstream,
       ),
     );
+    addTearDown(editable.dispose);
     editable.layout(BoxConstraints.loose(const Size(1000.0, 1000.0)));
 
-    final PipelineOwner owner = PipelineOwner(onNeedVisualUpdate: () { });
-    final _PointerRouterSpy spy = GestureBinding.instance.pointerRouter as _PointerRouterSpy;
+    final PipelineOwner owner = PipelineOwner(onNeedVisualUpdate: () {});
+    addTearDown(owner.dispose);
+    final _PointerRouterSpy spy =
+        GestureBinding.instance.pointerRouter as _PointerRouterSpy;
     editable.attach(owner);
     // This should register pointer into GestureBinding.instance.pointerRouter.
-    editable.handleEvent(const PointerDownEvent(), BoxHitTestEntry(editable, const Offset(10,10)));
+    editable.handleEvent(const PointerDownEvent(),
+        BoxHitTestEntry(editable, const Offset(10, 10)));
     GestureBinding.instance.pointerRouter.route(const PointerDownEvent());
     expect(spy.routeCount, greaterThan(0));
     editable.detach();
@@ -57,7 +59,7 @@ class _GestureBindingSpy extends AutomatedTestWidgetsFlutterBinding {
   PointerRouter get pointerRouter => _testPointerRouter;
 }
 
-class FakeEditableTextState extends Fake implements TextSelectionDelegate { }
+class FakeEditableTextState extends Fake implements TextSelectionDelegate {}
 
 class _PointerRouterSpy extends PointerRouter {
   int routeCount = 0;