TestClipPaintingContext should dispose ContainerLayer (#135949)

Author: polina-c

packages/flutter/test/rendering/rendering_tester.dart

@@ -381,7 +381,11 @@ class FakeTicker implements Ticker {
 }
 
 class TestClipPaintingContext extends PaintingContext {
-  TestClipPaintingContext() : super(ContainerLayer(), Rect.zero);
+  TestClipPaintingContext() : this._(ContainerLayer());
+
+  TestClipPaintingContext._(this._containerLayer) : super(_containerLayer, Rect.zero);
+
+  final ContainerLayer _containerLayer;
 
   @override
   ClipRectLayer? pushClipRect(
@@ -397,6 +401,11 @@ class TestClipPaintingContext extends PaintingContext {
   }
 
   Clip clipBehavior = Clip.none;
+
+  @mustCallSuper
+  void dispose() {
+    _containerLayer.dispose();
+  }
 }
 
 class TestPushLayerPaintingContext extends PaintingContext {

packages/flutter/test/widgets/grid_view_test.dart

@@ -664,16 +664,8 @@ void main() {
     final TestClipPaintingContext context = TestClipPaintingContext();
     renderObject.paint(context, Offset.zero);
     expect(context.clipBehavior, equals(Clip.none));
-  },
-  leakTrackingTestConfig: const LeakTrackingTestConfig(
-    // TODO(ksokolovskyi): remove after fixing
-    notDisposedAllowList: <String, int?> {
-      // https://github.com/flutter/flutter/issues/134575
-      'OffsetLayer': 1,
-      // https://github.com/flutter/flutter/issues/134572
-      'ContainerLayer': 1,
-    },
-  ));
+    context.dispose();
+  });
 
   testWidgetsWithLeakTracking('GridView respects clipBehavior', (WidgetTester tester) async {
     await tester.pumpWidget(
@@ -739,12 +731,8 @@ void main() {
     // 4th, check that a non-default clip behavior can be sent to the painting context.
     renderObject.paint(context, Offset.zero);
     expect(context.clipBehavior, equals(Clip.antiAlias));
-  },
-  leakTrackingTestConfig: const LeakTrackingTestConfig(
-    // TODO(ksokolovskyi): remove after fixing
-    // https://github.com/flutter/flutter/issues/134572
-    notDisposedAllowList: <String, int?> {'ContainerLayer': 1},
-  ));
+    context.dispose();
+  });
 
   testWidgetsWithLeakTracking('GridView.builder respects clipBehavior', (WidgetTester tester) async {
     await tester.pumpWidget(

packages/flutter/test/widgets/list_view_test.dart

@@ -730,12 +730,8 @@ void main() {
     // 4th, check that a non-default clip behavior can be sent to the painting context.
     renderObject.paint(context, Offset.zero);
     expect(context.clipBehavior, equals(Clip.antiAlias));
-  },
-  leakTrackingTestConfig: const LeakTrackingTestConfig(
-    // TODO(ksokolovskyi): remove after fixing
-    // https://github.com/flutter/flutter/issues/134572
-    notDisposedAllowList: <String, int?> {'ContainerLayer': 1},
-  ));
+    context.dispose();
+  });
 
   testWidgetsWithLeakTracking('ListView.builder respects clipBehavior', (WidgetTester tester) async {
     await tester.pumpWidget(