Consider backgroundBlendMode in equality of BoxDecoration (#100788)

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

@@ -320,6 +320,7 @@ class BoxDecoration extends Decoration {
         && other.borderRadius == borderRadius
         && listEquals<BoxShadow>(other.boxShadow, boxShadow)
         && other.gradient == gradient
+        && other.backgroundBlendMode == backgroundBlendMode
         && other.shape == shape;
   }
 
@@ -331,6 +332,7 @@ class BoxDecoration extends Decoration {
     borderRadius,
     boxShadow == null ? null : Object.hashAll(boxShadow!),
     gradient,
+    backgroundBlendMode,
     shape,
   );
 

packages/flutter/test/painting/box_decoration_test.dart

@@ -95,4 +95,17 @@ void main() {
     );
     expect(clipPath, isLookLikeExpectedPath);
   });
+
+  test('BoxDecorations with different blendModes are not equal', () {
+    // Regression test for https://github.com/flutter/flutter/issues/100754.
+    const BoxDecoration one = BoxDecoration(
+      color: Color(0x00000000),
+      backgroundBlendMode: BlendMode.color,
+    );
+    const BoxDecoration two = BoxDecoration(
+      color: Color(0x00000000),
+      backgroundBlendMode: BlendMode.difference,
+    );
+    expect(one == two, isFalse);
+  });
 }