Make sure that a RefreshProgressIndicator doesn't crash in 0x0 enviro…

[ahmedsameha1]

This is my attempt to handle #6537 for the RefreshProgressIndicator widget.

[gemini-code-assist]

Code Review

This pull request adds a regression test for an issue where RefreshProgressIndicator crashes in a zero-sized environment. The added test correctly reproduces one of the crash scenarios. I've suggested adding another test case to cover a related crash scenario with a non-square zero area, which would make the test coverage for this issue more complete.

[gemini-code-assist]

This is a great test for the zero-area crash scenario. The linked issue also mentions a crash when the RefreshProgressIndicator is in a non-square environment (e.g., zero width but non-zero height) due to an assertion size.width == size.height in _RefreshProgressIndicatorPainter.paintArrowhead. It would be beneficial to add another test case to cover that scenario as well, ensuring a more comprehensive fix.

For example, you could add a test like this:

testWidgets('RefreshProgressIndicator does not crash in non-square area', (WidgetTester tester) async {
  await tester.pumpWidget(
    const MaterialApp(
      home: Center(child: SizedBox(width: 0, height: 50, child: RefreshProgressIndicator())),
    ),
  );
  expect(tester.getSize(find.byType(RefreshProgressIndicator)), const Size(0, 50));
});

[dkwingsmt]

Checklist:

• The test is in the correct file
• The test name goes “does not crash at zero area”
• The target widget is wrapped by Center (or is fullscreen)
• The target widget does not have an overlay, or the overlay is tested
• The target widget is expected to have a size of exactly Size.zero

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