[ci] Roll Flutter to f842ed9 (flutter#4513)

Rolls Flutter `master` to f842ed9 manually.

The switch to Material 3 by default broke the expectations of the `dynamic_layouts` package; this updates them to handle the values reported starting with that switch.

Author: stuartmorgan-g

.ci/flutter_master.version

@@ -1 +1 @@
-c40173f114fa8b830531578586f4f4eedd2b2c1f
+f842ed916514879fe6898b2a5a4053c63c3308fe

packages/dynamic_layouts/example/test/wrap_example_test.dart

@@ -3,17 +3,17 @@
 // found in the LICENSE file.
 
 import 'package:example/wrap_layout_example.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
   testWidgets('Check that the children are layed out.',
       (WidgetTester tester) async {
-    await tester.pumpWidget(
-      const MaterialApp(
-        home: WrapExample(),
-      ),
+    const MaterialApp app = MaterialApp(
+      home: WrapExample(),
     );
+    await tester.pumpWidget(app);
     await tester.pumpAndSettle();
 
     // See if there are children layed out.
@@ -23,10 +23,29 @@ void main() {
     expect(find.text('Index 3'), findsOneWidget);
     expect(find.text('Index 4'), findsOneWidget);
 
+    // Material 3 changes the expected layout positioning.
+    final bool usesMaterial3 = (app.theme ?? ThemeData.light()).useMaterial3;
+    final Offset offset0 = usesMaterial3
+        ? Offset(0.0, _getExpectedYOffset(91.0))
+        : const Offset(0.0, 103.0);
+    final Offset offset1 = usesMaterial3
+        ? Offset(65.0, _getExpectedYOffset(121.0))
+        : const Offset(66.0, 124.0);
+    final Offset offset3 = usesMaterial3
+        ? Offset(270.0, _getExpectedYOffset(171.0))
+        : const Offset(271.0, 174.0);
+    final Offset offset4 = usesMaterial3
+        ? Offset(380.0, _getExpectedYOffset(221.0))
+        : const Offset(381.0, 224.0);
+
     // See if they are in expected position.
-    expect(tester.getTopLeft(find.text('Index 0')), const Offset(0.0, 103.0));
-    expect(tester.getTopLeft(find.text('Index 1')), const Offset(66.0, 124.0));
-    expect(tester.getTopLeft(find.text('Index 3')), const Offset(271.0, 174.0));
-    expect(tester.getTopLeft(find.text('Index 4')), const Offset(381.0, 224.0));
+    expect(tester.getTopLeft(find.text('Index 0')), offset0);
+    expect(tester.getTopLeft(find.text('Index 1')), offset1);
+    expect(tester.getTopLeft(find.text('Index 3')), offset3);
+    expect(tester.getTopLeft(find.text('Index 4')), offset4);
   });
 }
+
+double _getExpectedYOffset(double nonWeb) {
+  return kIsWeb ? nonWeb - 0.5 : nonWeb;
+}