FIX: UnderlineInputBorder hashCode and equality by including borderRadius (#118284)

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

@@ -259,12 +259,13 @@ class UnderlineInputBorder extends InputBorder {
     if (other.runtimeType != runtimeType) {
       return false;
     }
-    return other is InputBorder
-        && other.borderSide == borderSide;
+    return other is UnderlineInputBorder
+        && other.borderSide == borderSide
+        && other.borderRadius == borderRadius;
   }
 
   @override
-  int get hashCode => borderSide.hashCode;
+  int get hashCode => Object.hash(borderSide, borderRadius);
 }
 
 /// Draws a rounded rectangle around an [InputDecorator]'s container.

packages/flutter/test/material/input_decorator_test.dart

@@ -5338,11 +5338,40 @@ void main() {
       gapPadding: 32.0,
     ));
     expect(outlineInputBorder, isNot(const OutlineInputBorder()));
+    expect(outlineInputBorder, isNot(const OutlineInputBorder(
+      borderSide: BorderSide(color: Colors.red),
+      borderRadius: BorderRadius.all(Radius.circular(9.0)),
+      gapPadding: 32.0,
+    )));
+    expect(outlineInputBorder, isNot(const OutlineInputBorder(
+      borderSide: BorderSide(color: Colors.blue),
+      borderRadius: BorderRadius.all(Radius.circular(10.0)),
+      gapPadding: 32.0,
+    )));
+    expect(outlineInputBorder, isNot(const OutlineInputBorder(
+      borderSide: BorderSide(color: Colors.blue),
+      borderRadius: BorderRadius.all(Radius.circular(9.0)),
+      gapPadding: 33.0,
+    )));
 
-    // UnderlineInputBorder's equality is defined only by the borderSide
-    const UnderlineInputBorder underlineInputBorder = UnderlineInputBorder(borderSide: BorderSide(color: Colors.blue));
-    expect(underlineInputBorder, const UnderlineInputBorder(borderSide: BorderSide(color: Colors.blue)));
+    // UnderlineInputBorder's equality is defined by the borderSide and borderRadius
+    const UnderlineInputBorder underlineInputBorder = UnderlineInputBorder(
+      borderSide: BorderSide(color: Colors.blue),
+      borderRadius: BorderRadius.only(topLeft: Radius.circular(5.0), topRight: Radius.circular(5.0)),
+    );
+    expect(underlineInputBorder, const UnderlineInputBorder(
+      borderSide: BorderSide(color: Colors.blue),
+      borderRadius: BorderRadius.only(topLeft: Radius.circular(5.0), topRight: Radius.circular(5.0)),
+    ));
     expect(underlineInputBorder, isNot(const UnderlineInputBorder()));
+    expect(underlineInputBorder, isNot(const UnderlineInputBorder(
+      borderSide: BorderSide(color: Colors.red),
+      borderRadius: BorderRadius.only(topLeft: Radius.circular(5.0), topRight: Radius.circular(5.0)),
+    )));
+    expect(underlineInputBorder, isNot(const UnderlineInputBorder(
+      borderSide: BorderSide(color: Colors.blue),
+      borderRadius: BorderRadius.only(topLeft: Radius.circular(6.0), topRight: Radius.circular(6.0)),
+    )));
   });
 
   test('InputBorder hashCodes', () {
@@ -5358,11 +5387,39 @@ void main() {
       gapPadding: 32.0,
     ).hashCode);
     expect(outlineInputBorder.hashCode, isNot(const OutlineInputBorder().hashCode));
+    expect(outlineInputBorder.hashCode, isNot(const OutlineInputBorder(
+      borderRadius: BorderRadius.all(Radius.circular(9.0)),
+      borderSide: BorderSide(color: Colors.red),
+      gapPadding: 32.0,
+    ).hashCode));
+    expect(outlineInputBorder.hashCode, isNot(const OutlineInputBorder(
+      borderRadius: BorderRadius.all(Radius.circular(10.0)),
+      borderSide: BorderSide(color: Colors.blue),
+      gapPadding: 32.0,
+    ).hashCode));
+    expect(outlineInputBorder.hashCode, isNot(const OutlineInputBorder(
+      borderRadius: BorderRadius.all(Radius.circular(9.0)),
+      borderSide: BorderSide(color: Colors.blue),
+      gapPadding: 33.0,
+    ).hashCode));
 
-    // UnderlineInputBorder's hashCode is defined only by the borderSide
-    const UnderlineInputBorder underlineInputBorder = UnderlineInputBorder(borderSide: BorderSide(color: Colors.blue));
-    expect(underlineInputBorder.hashCode, const UnderlineInputBorder(borderSide: BorderSide(color: Colors.blue)).hashCode);
-    expect(underlineInputBorder.hashCode, isNot(const UnderlineInputBorder().hashCode));
+    // UnderlineInputBorder's hashCode is defined by the borderSide and borderRadius
+    const UnderlineInputBorder underlineInputBorder = UnderlineInputBorder(
+      borderSide: BorderSide(color: Colors.blue),
+      borderRadius: BorderRadius.only(topLeft: Radius.circular(5.0), topRight: Radius.circular(5.0)),
+    );
+    expect(underlineInputBorder.hashCode, const UnderlineInputBorder(
+      borderSide: BorderSide(color: Colors.blue),
+      borderRadius: BorderRadius.only(topLeft: Radius.circular(5.0), topRight: Radius.circular(5.0)),
+    ).hashCode);
+    expect(underlineInputBorder.hashCode, isNot(const UnderlineInputBorder(
+      borderSide: BorderSide(color: Colors.red),
+      borderRadius: BorderRadius.only(topLeft: Radius.circular(5.0), topRight: Radius.circular(5.0)),
+    ).hashCode));
+    expect(underlineInputBorder.hashCode, isNot(const UnderlineInputBorder(
+      borderSide: BorderSide(color: Colors.blue),
+      borderRadius: BorderRadius.only(topLeft: Radius.circular(6.0), topRight: Radius.circular(6.0)),
+    ).hashCode));
   });
 
   testWidgets('InputDecorationTheme implements debugFillDescription', (WidgetTester tester) async {