Pass MaterialButton.disabledElevation into RawMaterialButton (#58209)

* Pass disabledElevation from MaterialButton into RawMaterialButton

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

@@ -415,6 +415,7 @@ class MaterialButton extends StatelessWidget {
       animationDuration: buttonTheme.getAnimationDuration(this),
       child: child,
       materialTapTargetSize: materialTapTargetSize ?? theme.materialTapTargetSize,
+      disabledElevation: disabledElevation ?? 0.0,
     );
   }
 

packages/flutter/test/material/material_button_test.dart

@@ -841,4 +841,47 @@ void main() {
     expect(box.size, equals(const Size(76, 36)));
     expect(childRect, equals(const Rect.fromLTRB(372.0, 293.0, 428.0, 307.0)));
   });
+
+  testWidgets('disabledElevation is passed to RawMaterialButton', (WidgetTester tester) async {
+    const double disabledElevation = 16;
+
+    final Finder rawMaterialButtonFinder = find.descendant(
+        of: find.byType(MaterialButton),
+        matching: find.byType(RawMaterialButton)
+    );
+
+    await tester.pumpWidget(
+      const Directionality(
+        textDirection: TextDirection.ltr,
+        child: MaterialButton(
+          disabledElevation: disabledElevation,
+          onPressed: null, // disabled button
+          child: Text('button'),
+        ),
+      ),
+    );
+
+    final RawMaterialButton rawMaterialButton = tester.widget(rawMaterialButtonFinder);
+    expect(rawMaterialButton.disabledElevation, equals(disabledElevation));
+  });
+
+  testWidgets('MaterialButton.disabledElevation defaults to 0.0 when not provided', (WidgetTester tester) async {
+    final Finder rawMaterialButtonFinder = find.descendant(
+        of: find.byType(MaterialButton),
+        matching: find.byType(RawMaterialButton)
+    );
+
+    await tester.pumpWidget(
+      const Directionality(
+        textDirection: TextDirection.ltr,
+        child: MaterialButton(
+          onPressed: null, // disabled button
+          child: Text('button'),
+        ),
+      ),
+    );
+
+    final RawMaterialButton rawMaterialButton = tester.widget(rawMaterialButtonFinder);
+    expect(rawMaterialButton.disabledElevation, equals(0.0));
+  });
 }