Revert "InkDecoration do not paint if it's part of the tree doesn't get painted (#61216)" (#61963)

This reverts commit fdf87edd.

packages/flutter/lib/src/rendering/stack.dart

@@ -8,7 +8,6 @@ import 'dart:math' as math;
 import 'dart:ui' show lerpDouble, hashValues;
 
 import 'package:flutter/foundation.dart';
-import 'package:vector_math/vector_math_64.dart' show Matrix4;
 
 import 'box.dart';
 import 'object.dart';
@@ -708,22 +707,6 @@ class RenderIndexedStack extends RenderStack {
     context.paintChild(child, childParentData.offset + offset);
   }
 
-  @override
-  void applyPaintTransform(RenderObject child, Matrix4 transform) {
-    if (firstChild == null || index == null)
-      return;
-    final RenderBox childAtIndex = _childAtIndex();
-    if (child != childAtIndex)
-      // It is possible that the offstage widgets want to paint themselves.
-      // For example, the Material widget tries to paint all
-      // InkFeatures under its subtree as long as they are not disposed. In
-      // such case, we give it a zero transform to prevent them from painting.
-      // https://github.com/flutter/flutter/issues/59963
-      transform.setZero();
-    else
-      super.applyPaintTransform(child, transform);
-  }
-
   @override
   void debugFillProperties(DiagnosticPropertiesBuilder properties) {
     super.debugFillProperties(properties);

packages/flutter/test/material/dropdown_test.dart

@@ -341,19 +341,11 @@ void main() {
 
   testWidgets('Dropdown button control test', (WidgetTester tester) async {
     String value = 'one';
-    StateSetter setState;
     void didChangeValue(String newValue) {
-      setState(() {
       value = newValue;
-      });
     }
 
-    Widget build() {
-      return StatefulBuilder(builder: (BuildContext context, StateSetter setter) {
-        setState = setter;
-        return buildFrame(value: value, onChanged: didChangeValue);
-      },);
-    }
+    Widget build() => buildFrame(value: value, onChanged: didChangeValue);
 
     await tester.pumpWidget(build());
 
@@ -388,16 +380,11 @@ void main() {
 
   testWidgets('Dropdown button with no app', (WidgetTester tester) async {
     String value = 'one';
-    StateSetter setState;
     void didChangeValue(String newValue) {
-      setState(() {
       value = newValue;
-      });
     }
 
     Widget build() {
-      return StatefulBuilder(builder: (BuildContext context, StateSetter setter) {
-        setState = setter;
       return Directionality(
         textDirection: TextDirection.ltr,
         child: Navigator(
@@ -407,14 +394,13 @@ void main() {
               settings: settings,
               builder: (BuildContext context) {
                 return Material(
-                    child: buildFrame(value: value, onChanged: didChangeValue),
+                  child: buildFrame(value: 'one', onChanged: didChangeValue),
                 );
               },
             );
           },
         ),
       );
-      },);
     }
 
     await tester.pumpWidget(build());
@@ -2500,22 +2486,15 @@ void main() {
   testWidgets('DropdownButton onTap callback is called when defined', (WidgetTester tester) async {
     int dropdownButtonTapCounter = 0;
     String value = 'one';
-    StateSetter setState;
 
-    void onChanged(String newValue) {
-      setState(() {
-        value = newValue;
-      });
-    }
+    void onChanged(String newValue) { value = newValue; }
     void onTap() { dropdownButtonTapCounter += 1; }
 
-    Widget build() {
-      return StatefulBuilder(builder: (BuildContext context, StateSetter setter) {
-        setState = setter;
-        return buildFrame(value: value, onChanged: onChanged, onTap: onTap,);
-      },);
-    }
-
+    Widget build() => buildFrame(
+      value: value,
+      onChanged: onChanged,
+      onTap: onTap,
+    );
     await tester.pumpWidget(build());
 
     expect(dropdownButtonTapCounter, 0);
@@ -2551,15 +2530,8 @@ void main() {
 
   testWidgets('DropdownMenuItem onTap callback is called when defined', (WidgetTester tester) async {
     String value = 'one';
-    int currentIndex = -1;
-    StateSetter setState;
-    void onChanged(String newValue) {
-      setState(() {
-        currentIndex = -1;
-        value = newValue;
-      });
-    }
     final List<int> menuItemTapCounters = <int>[0, 0, 0, 0];
+    void onChanged(String newValue) { value = newValue; }
 
     final List<VoidCallback> onTapCallbacks = <VoidCallback>[
       () { menuItemTapCounters[0] += 1; },
@@ -2568,10 +2540,9 @@ void main() {
       () { menuItemTapCounters[3] += 1; },
     ];
 
-    Widget build() {
-      return StatefulBuilder(builder: (BuildContext context, StateSetter setter) {
-        setState = setter;
-        return TestApp(
+    int currentIndex = -1;
+    await tester.pumpWidget(
+      TestApp(
         textDirection: TextDirection.ltr,
         child: Material(
           child: RepaintBoundary(
@@ -2589,11 +2560,8 @@ void main() {
             ),
           ),
         ),
+      ),
     );
-      });
-    }
-
-    await tester.pumpWidget(build());
 
     // Tap dropdown button.
     await tester.tap(find.text('one'));

packages/flutter/test/material/ink_paint_test.dart

@@ -434,36 +434,4 @@ void main() {
       throw 'Expected: paint.color.alpha == 0, found: ${paint.color.alpha}';
     }));
   });
-
-  testWidgets('Does the Ink widget render anything if it have ancestor IndexedStack', (WidgetTester tester) async {
-    // Regressing test for https://github.com/flutter/flutter/issues/59963
-    int index = 0;
-    Widget build() => Directionality(
-      textDirection: TextDirection.ltr,
-      child: Material(
-        child: IndexedStack(
-          index: index,
-          children: <Widget>[
-            Ink(width: 100, height: 100, decoration: const BoxDecoration(color: Colors.black)),
-            Ink(width: 50, height: 50, decoration: const BoxDecoration(color: Colors.red)),
-          ],
-        ),
-      ),
-    );
-
-    await tester.pumpWidget(build());
-
-    final RenderBox box = Material.of(tester.element(find.byType(IndexedStack))) as RenderBox;
-
-    expect(box, paints..rect(rect: const Rect.fromLTRB(0.0, 0.0, 100.0, 100.0), color: Color(Colors.black.value)));
-
-    // update index, child do not at index should not be painted by have a zero
-    // transform.
-    index = 1;
-    await tester.pumpWidget(build());
-
-    expect(box, paints..transform(
-      matrix4: equals(<dynamic>[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]),
-    ));
-  });
 }