Fix build when using source generators

[ThomasGoulet73]

Fixes #6522
Fixes dotnet/roslyn#60257

Description

Fixes the build when using source generators.

Customer Impact

Without this PR, customers cannot build a WPF application with source generators.

Regression

No. To my knowledge, it never worked.

Testing

Tested by building a blank WPF application that uses the Regex source generator. This PR fixed the build.

Risk

Low.

/cc @RussKie (It looks like your hunch about the Analyzers property was right)

Microsoft Reviewers: Open in CodeFlow

[RussKie]

Nice! Can you please share binlogs generated before and after the change?

It would be great to add a test to dotnet/sdk (I guess here https://github.com/dotnet/sdk/tree/main/src/Assets/TestProjects) that creates a simple WPF app with a source generator. The test will be failing until this change is merged and flown through.

@singhashish-wpf we'd want this fix serviced into 6.0.

[ThomasGoulet73]

Nice! Can you please share binlogs generated before and after the change?

Sure. Here's the binlogs + the project I used: WpfAppSourceGenerator.zip

It would be great to add a test to dotnet/sdk (I guess here https://github.com/dotnet/sdk/tree/main/src/Assets/TestProjects) that creates a simple WPF app with a source generator. The test will be failing until this change is merged and flown through.

I'll take a look at adding a test project.

[RussKie]

Thank you!