[iOS] BackButtonBehavior IsEnabled - fix

[kubaflo]

Issues Fixed

Fixes #28722

[dotnet-policy-service]

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

[Copilot]

Pull Request Overview

This PR fixes the issue where the IsEnabled property in BackButtonBehavior does not work correctly on iOS. The changes include new test cases to exercise the behavior, an update to the IsEnabledCore setter in BackButtonBehavior, and a check in ShellSectionRenderer that respects the IsEnabled setting.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue28722.cs	Added a test to verify BackButtonBehavior.IsEnabled functionality
src/Controls/tests/TestCases.HostApp/Issues/Issue28722.cs	Updated the host app to include a page testing BackButtonBehavior behavior
src/Controls/src/Core/Shell/BackButtonBehavior.cs	Modified IsEnabledCore setter to combine the value with the current IsEnabled
src/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellSectionRenderer.cs	Added a check to prevent navigation when BackButtonBehavior is disabled

Comments suppressed due to low confidence (1)

src/Controls/src/Core/Shell/BackButtonBehavior.cs:77

• The new logic in the IsEnabledCore setter combines the assigned value with the current IsEnabled state, which may lead to unintended behavior if the public IsEnabled property is updated independently. Consider reviewing this logic to ensure it meets the intended behavior, or add a clarifying comment to prevent future confusion.

bool IsEnabledCore { set => SetValue(IsEnabledProperty, value && IsEnabled); }

[jsuarezruiz]

/azp run

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