fix: Enable mouse drag for RefreshIndicator.noSpinner example

[Franklyn-R-Silva]

This PR adds scrollBehavior to the RefreshIndicator.noSpinner sample to allow mouse dragging on desktop platforms, addressing the issue where it was impossible to trigger the refresh with a mouse.

Fixes #179711

[flutter-dashboard]

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[gemini-code-assist]

Code Review

This pull request enables mouse dragging for the RefreshIndicator.noSpinner example by setting a custom scrollBehavior on the MaterialApp. The change correctly addresses the issue. I've provided a few suggestions to improve code clarity and robustness, such as removing a redundant import and temporary comments, and using a more future-proof way to specify the drag devices.

[victorsanni]

Thanks for this PR. It will need a test to land.

[Franklyn-R-Silva]

Thanks for this PR. It will need a test to land.

Thank you for the feedback! I have just updated the PR to include a new widget test in examples/api/test/material/refresh_indicator/refresh_indicator.2_test.dart

testWidgets('Pulling with mouse pointer triggers a refresh indicator', (
    WidgetTester tester,
  ) async {
    await tester.pumpWidget(const example.RefreshIndicatorExampleApp());

    // Simulate a mouse drag gesture to trigger the refresh.
    final TestGesture gesture = await tester.startGesture(
      tester.getCenter(find.text('Pull down here').first),
      kind: PointerDeviceKind.mouse,
    );
    await gesture.moveBy(const Offset(0.0, 300.0));
    await tester.pump();
    await gesture.up();

    await tester.pump();
    await tester.pump(const Duration(seconds: 1));
    await tester.pump(const Duration(seconds: 1));

    expect(
      find.bySemanticsLabel('Circular progress indicator'),
      findsOneWidget,
    );

    await tester.pumpAndSettle();
  });

[victorsanni]

Thanks for the fix!

[hannah-hyj]

LGTM