update SelectAllTextBehavior doc to explain .net non-runtime issue

[TrueMoniker]

The SelectAllTextBehavior cannot be referenced from a project that runs .NET without a native runtime. Because of the way unit tests run in Maui, it's common to have a version of .NET as the target framework. Adding a note at the top of the document could save someone from implementing it in a project that is .NET only.

[learn-build-service-prod]

Learn Build status updates of commit 9cb7eef:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/maui/behaviors/select-all-text-behavior.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[bijington]

The project the behavior is contained within does support .NET (see https://github.com/CommunityToolkit/Maui/blob/main/src/CommunityToolkit.Maui/CommunityToolkit.Maui.csproj).

I wonder if the XAML compiler isn't retaining the type. If you try adding this line somewhere in your tests does it solve the issue?

_ = new SelectAllTextBehavior();

[TrueMoniker]

@bijington Thank you for the suggestion. I tried it but had the same error. I have created an example project in this repo.
I didn't create an issue originally because I thought this behavior was intentional. Should I create an issue rather than the doc update?

[bijington]

@bijington Thank you for the suggestion. I tried it but had the same error. I have created an example project in this repo. I didn't create an issue originally because I thought this behavior was intentional. Should I create an issue rather than the doc update?

Thanks for providing your sample. So I think this is a bug in the toolkit. All of our other behaviours have an implementation for plain netX TFMs but SelectAllTextBehavior doesn't.

[bijington]

I have raised the bug here: CommunityToolkit/Maui#1847. For now I will close this PR down as I think we should make a change to the code instead.