[material_ui] Fix MenuAnchor scrollbar safe-area padding

packages/material_ui/lib/src/menu_anchor.dart

@@ -3697,6 +3697,7 @@ class _MenuPanelState extends State<_MenuPanel> {
     final EdgeInsetsGeometry padding =
         resolve<EdgeInsetsGeometry?>((MenuStyle? style) => style?.padding) ?? EdgeInsets.zero;
     final Offset densityAdjustment = visualDensity.baseSizeAdjustment;
+    final MediaQueryData mediaQuery = MediaQuery.of(context);
     // Per the Material Design team: don't allow the VisualDensity
     // adjustment to reduce the width of the left/right padding. If we
     // did, VisualDensity.compact, the default for desktop/web, would
@@ -3757,17 +3758,28 @@ class _MenuPanelState extends State<_MenuPanel> {
         ).copyWith(scrollbars: false, overscroll: false, physics: const ClampingScrollPhysics()),
         child: PrimaryScrollController(
           controller: scrollController,
-          child: Scrollbar(
-            thumbVisibility: displayScrollbar,
-            child: SingleChildScrollView(
-              controller: scrollController,
-              scrollDirection: widget.orientation,
-              child: Flex(
-                crossAxisAlignment: CrossAxisAlignment.start,
-                textDirection: Directionality.of(context),
-                direction: widget.orientation,
-                mainAxisSize: MainAxisSize.min,
-                children: children,
+          child: MediaQuery(
+            data: mediaQuery.removePadding(
+              removeLeft: true,
+              removeTop: true,
+              removeRight: true,
+              removeBottom: true,
+            ),
+            child: Scrollbar(
+              thumbVisibility: displayScrollbar,
+              child: MediaQuery(
+                data: mediaQuery,
+                child: SingleChildScrollView(
+                  controller: scrollController,
+                  scrollDirection: widget.orientation,
+                  child: Flex(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    textDirection: Directionality.of(context),
+                    direction: widget.orientation,
+                    mainAxisSize: MainAxisSize.min,
+                    children: children,
+                  ),
+                ),
               ),
             ),
           ),

packages/material_ui/pending_changelogs/change_2026_08_14_menu_anchor_scrollbar.yaml

@@ -0,0 +1,3 @@
+changelog: |
+  - Fixes `MenuAnchor` scrollbars inheriting system safe-area padding.
+version: patch

packages/material_ui/test/menu_anchor_test.dart

@@ -566,6 +566,54 @@ void main() {
     expect(find.byType(Scrollbar).last, paints..rrect(color: const Color(0xff00ff00)));
   }, variant: TargetPlatformVariant.desktop());
 
+  // Regression test for https://github.com/flutter/flutter/issues/188155.
+  testWidgets('Menu scrollbar does not inherit MediaQuery padding', (WidgetTester tester) async {
+    addTearDown(tester.view.reset);
+    tester.view.devicePixelRatio = 1.0;
+    tester.view.padding = const FakeViewPadding(bottom: 24.0);
+    EdgeInsets? menuItemPadding;
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: MenuAnchor(
+            controller: controller,
+            style: const MenuStyle(
+              maximumSize: WidgetStatePropertyAll<Size>(Size.fromHeight(100.0)),
+            ),
+            menuChildren: <Widget>[
+              Builder(
+                builder: (BuildContext context) {
+                  menuItemPadding = MediaQuery.paddingOf(context);
+                  return MenuItemButton(onPressed: () {}, child: const Text('Item 0'));
+                },
+              ),
+              for (int i = 1; i < 4; i++) MenuItemButton(onPressed: () {}, child: Text('Item $i')),
+            ],
+            builder: (BuildContext context, MenuController controller, Widget? child) {
+              return TextButton(onPressed: controller.open, child: const Text('Open menu'));
+            },
+          ),
+        ),
+      ),
+    );
+
+    await tester.tap(find.text('Open menu'));
+    await tester.pumpAndSettle();
+
+    final CustomPaint scrollbarPaint = tester.widget<CustomPaint>(
+      find.descendant(
+        of: find.byType(Scrollbar),
+        matching: find.byWidgetPredicate(
+          (Widget widget) => widget is CustomPaint && widget.foregroundPainter is ScrollbarPainter,
+        ),
+      ),
+    );
+    final scrollbarPainter = scrollbarPaint.foregroundPainter! as ScrollbarPainter;
+    expect(scrollbarPainter.padding, EdgeInsets.zero);
+    expect(menuItemPadding, const EdgeInsets.only(bottom: 24.0));
+  });
+
   testWidgets('Focus is returned to previous focus before invoking onPressed', (
     WidgetTester tester,
   ) async {