[Testing] Refactoring Feature Matrix UITest Cases for SearchBar Control

[NafeelaNazhir]

Note

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It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

This pull request enhances the SearchBar feature matrix test pages by expanding the set of configurable properties and improving the test UI for better usability and coverage. The changes include adding new bindable properties, updating the options page to expose more features, adding Material3 test variants, and refining input handling for better reliability.

SearchBar feature expansion and UI improvements:

• SearchBarControlPage.xaml.cs now resets the shared view model via SearchBarViewModel.Reset() instead of recreating and rebinding the SearchBar on every navigation, improving reliability of the options flow.
• The options page (SearchBarOptionsPage.xaml/.xaml.cs) introduces new controls for configuring SearchIconColor, Background, and ReturnType, and fixes the TextTransform/FontAutoScalingEnabled radio button handling so selections are applied correctly.
• SearchBarViewModel.cs adds backing properties for SearchIconColor, ReturnType, and Background, along with a Reset() method to restore default values between test runs.
• Material3_SearchBarControlPage.xaml.cs binds the new Background, ReturnType, and SearchIconColor properties for Material3 coverage.

Test coverage:

• SearchBarFeatureTests.cs is updated with new test cases covering FlowDirection, IsEnabled, SearchIconColor, BackgroundColor, Shadow with Background, text changed events, and TextTransform behavior.
• SearchBarMaterial3FeatureTests.cs adds Material3-specific coverage for SearchIconColor and BackgroundColor.

Issues Identified

• [Windows] Setting Shadow on SearchBar causes InteropServices.COMException #38188

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.sh | bash -s -- 38191

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.ps1) } 38191"

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[dotnet-policy-service]

Hey there @@NafeelaNazhir! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[sheiksyedm]

/azp run maui-pr-uitests

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[vishnumenon2684]

/azp run maui-pr-uitests , maui-pr-devicetests

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