Fix/decoration equality (#61551)

packages/flutter/lib/src/painting/box_decoration.dart

@@ -321,7 +321,7 @@ class BoxDecoration extends Decoration {
         && other.image == image
         && other.border == border
         && other.borderRadius == borderRadius
-        && other.boxShadow == boxShadow
+        && listEquals<BoxShadow>(other.boxShadow, boxShadow)
         && other.gradient == gradient
         && other.shape == shape;
   }
@@ -333,7 +333,7 @@ class BoxDecoration extends Decoration {
       image,
       border,
       borderRadius,
-      boxShadow,
+      hashList(boxShadow),
       gradient,
       shape,
     );

packages/flutter/lib/src/painting/shape_decoration.dart

@@ -257,7 +257,7 @@ class ShapeDecoration extends Decoration {
         && other.color == color
         && other.gradient == gradient
         && other.image == image
-        && other.shadows == shadows
+        && listEquals<BoxShadow>(other.shadows, shadows)
         && other.shape == shape;
   }
 
@@ -268,7 +268,7 @@ class ShapeDecoration extends Decoration {
       gradient,
       image,
       shape,
-      shadows,
+      hashList(shadows),
     );
   }
 

packages/flutter/test/painting/decoration_test.dart

@@ -126,6 +126,21 @@ void main() {
     expect(c.color, equals(b.color));
   });
 
+  test('Decoration equality', () {
+    const BoxDecoration a = BoxDecoration(
+      color: Color(0xFFFFFFFF),
+      boxShadow: <BoxShadow>[BoxShadow()],
+    );
+
+    const BoxDecoration b = BoxDecoration(
+      color: Color(0xFFFFFFFF),
+      boxShadow: <BoxShadow>[BoxShadow()],
+    );
+
+    expect(a.hashCode, equals(b.hashCode));
+    expect(a, equals(b));
+  });
+
   test('BoxDecorationImageListenerSync', () {
     final ImageProvider imageProvider = SynchronousTestImageProvider();
     final DecorationImage backgroundImage = DecorationImage(image: imageProvider);

packages/flutter/test/widgets/shape_decoration_test.dart

@@ -115,4 +115,21 @@ Future<void> main() async {
       ],
     );
   });
+
+  test('ShapeDecoration equality', () {
+    const ShapeDecoration a = ShapeDecoration(
+      color: Color(0xFFFFFFFF),
+      shadows: <BoxShadow>[BoxShadow()],
+      shape: Border(),
+    );
+
+    const ShapeDecoration b = ShapeDecoration(
+      color: Color(0xFFFFFFFF),
+      shadows: <BoxShadow>[BoxShadow()],
+      shape: Border(),
+    );
+
+    expect(a.hashCode, equals(b.hashCode));
+    expect(a, equals(b));
+  });
 }