Fix chips onDeleted callback don't show the delete button when disabled (#137685)

fixes [Chips with `onDeleted` callback should show the delete button in the `disabled` state](flutter/flutter#136638)

### Code sample

<details>
<summary>expand to view the code sample</summary> 

```dart
import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @OverRide
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Example(),
    );
  }
}

class Example extends StatefulWidget {
  const Example({super.key});

  @OverRide
  State<Example> createState() => _ExampleState();
}

class _ExampleState extends State<Example> {

  @OverRide
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: <Widget>[
            RawChip(
              avatar: const Icon(Icons.favorite_rounded),
              label: const Text('RawChip'),
              onSelected: null,
              isEnabled: false,
              onDeleted: () {},
            ),
            InputChip(
              avatar: const Icon(Icons.favorite_rounded),
              label: const Text('InputChip'),
              isEnabled: false,
              onPressed: null,
              onDeleted: () {},
            ),
            FilterChip(
              avatar: const Icon(Icons.favorite_rounded),
              label: const Text('FilterChip'),
              onSelected: null,
              onDeleted: () {},
            ),
          ],
        ),
      ),
    );
  }
}
```

</details>

| Before | After |
| --------------- | --------------- |
| <img src="https://github.com/flutter/flutter/assets/48603081/8bd458de-cfd2-44f0-a0dd-a8298938c61f" /> | <img src="https://github.com/flutter/flutter/assets/48603081/afca0684-b061-416b-b029-5316588c6888" /> |

Author: TahaTesser

packages/flutter/lib/src/material/chip.dart

@@ -2064,26 +2064,39 @@ class _RenderChip extends RenderBox with SlottedContainerRenderObjectMixin<_Chip
     }
   }
 
-  final LayerHandle<OpacityLayer> _childOpacityLayerHandler = LayerHandle<OpacityLayer>();
+  final LayerHandle<OpacityLayer> _labelOpacityLayerHandler = LayerHandle<OpacityLayer>();
+  final LayerHandle<OpacityLayer> _deleteIconOpacityLayerHandler = LayerHandle<OpacityLayer>();
 
-  void _paintChild(PaintingContext context, Offset offset, RenderBox? child, bool? isEnabled) {
+  void _paintChild(PaintingContext context, Offset offset, RenderBox? child, {required bool isDeleteIcon}) {
     if (child == null) {
-      _childOpacityLayerHandler.layer = null;
+      _labelOpacityLayerHandler.layer = null;
+      _deleteIconOpacityLayerHandler.layer = null;
       return;
     }
     final int disabledColorAlpha = _disabledColor.alpha;
     if (!enableAnimation.isCompleted) {
       if (needsCompositing) {
-        _childOpacityLayerHandler.layer = context.pushOpacity(
+        _labelOpacityLayerHandler.layer = context.pushOpacity(
           offset,
           disabledColorAlpha,
           (PaintingContext context, Offset offset) {
             context.paintChild(child, _boxParentData(child).offset + offset);
           },
-          oldLayer: _childOpacityLayerHandler.layer,
+          oldLayer: _labelOpacityLayerHandler.layer,
         );
+        if (isDeleteIcon) {
+          _deleteIconOpacityLayerHandler.layer = context.pushOpacity(
+            offset,
+            disabledColorAlpha,
+            (PaintingContext context, Offset offset) {
+              context.paintChild(child, _boxParentData(child).offset + offset);
+            },
+            oldLayer: _deleteIconOpacityLayerHandler.layer,
+          );
+        }
       } else {
-        _childOpacityLayerHandler.layer = null;
+        _labelOpacityLayerHandler.layer = null;
+        _deleteIconOpacityLayerHandler.layer = null;
         final Rect childRect = _boxRect(child).shift(offset);
         context.canvas.saveLayer(childRect.inflate(20.0), Paint()..color = _disabledColor);
         context.paintChild(child, _boxParentData(child).offset + offset);
@@ -2114,7 +2127,8 @@ class _RenderChip extends RenderBox with SlottedContainerRenderObjectMixin<_Chip
 
   @override
   void dispose() {
-    _childOpacityLayerHandler.layer = null;
+    _labelOpacityLayerHandler.layer = null;
+    _deleteIconOpacityLayerHandler.layer = null;
     _avatarOpacityLayerHandler.layer = null;
     super.dispose();
   }
@@ -2123,9 +2137,9 @@ class _RenderChip extends RenderBox with SlottedContainerRenderObjectMixin<_Chip
   void paint(PaintingContext context, Offset offset) {
     _paintAvatar(context, offset);
     if (deleteIconShowing) {
-      _paintChild(context, offset, deleteIcon, isEnabled);
+      _paintChild(context, offset, deleteIcon, isDeleteIcon: true);
     }
-    _paintChild(context, offset, label, isEnabled);
+    _paintChild(context, offset, label, isDeleteIcon: false);
   }
 
   // Set this to true to have outlines of the tap targets drawn over

packages/flutter/test/material/chip_test.dart

@@ -2,6 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// This file is run as part of a reduced test set in CI on Mac and Windows
+// machines.
+@Tags(<String>['reduced-test-set'])
+library;
+
 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
@@ -3653,6 +3658,21 @@ void main() {
     expect(tester.takeException(), isNull);
   });
 
+  testWidgetsWithLeakTracking('Delete button is visible RawChip is disabled', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      wrapForChip(
+        child: RawChip(
+          isEnabled: false,
+          label: const Text('Label'),
+          onDeleted: () { },
+        )
+      ),
+    );
+
+    // Delete button should be visible.
+    expectLater(find.byType(RawChip), matchesGoldenFile('raw_chip.disabled.delete_button.png'));
+  });
+
   group('Material 2', () {
     // These tests are only relevant for Material 2. Once Material 2
     // support is deprecated and the APIs are removed, these tests

packages/flutter/test/material/filter_chip_test.dart

@@ -2,6 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// This file is run as part of a reduced test set in CI on Mac and Windows
+// machines.
+@Tags(<String>['reduced-test-set'])
+library;
+
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -919,4 +924,19 @@ void main() {
 
     feedback.dispose();
   });
+
+  testWidgetsWithLeakTracking('Delete button is visible FilterChip is disabled', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      wrapForChip(
+        child: FilterChip(
+          label: const Text('Label'),
+          onSelected: null,
+          onDeleted: () { },
+        )
+      ),
+    );
+
+    // Delete button should be visible.
+    expectLater(find.byType(RawChip), matchesGoldenFile('filter_chip.disabled.delete_button.png'));
+  });
 }

packages/flutter/test/material/input_chip_test.dart

@@ -2,6 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// This file is run as part of a reduced test set in CI on Mac and Windows
+// machines.
+@Tags(<String>['reduced-test-set'])
+library;
+
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
@@ -411,4 +416,19 @@ void main() {
 
     expect(getIconData(tester).color, const Color(0xff00ff00));
   });
+
+  testWidgetsWithLeakTracking('Delete button is visible InputChip is disabled', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      wrapForChip(
+        child: InputChip(
+          isEnabled: false,
+          label: const Text('Label'),
+          onDeleted: () { },
+        )
+      ),
+    );
+
+    // Delete button should be visible.
+    expectLater(find.byType(RawChip), matchesGoldenFile('input_chip.disabled.delete_button.png'));
+  });
 }