Version Used:

Visual Studio 2022 17.0.4
Microsoft.CodeAnalysis.Analyzers 3.3.3
Microsoft.CodeAnalysis.CSharp.Workspaces 4.0.1

Steps to Reproduce:

1. Clone the repro project
2. Open SourceGenerator.IntellisenseBug.Demo.sln in Visual Studio 2022 17.0.4
3. Build the solution
4. Observe the following behavior:

Expected Behavior:

• Intellisense and syntax highlight should continue to work with source-generated code.
• Visual Studio should not report errors in the Errors Window when the build actually succeeds, as per the Output Window.
• List of generated files should be shown in solution explorer under Analyzers -> SourceGen.IntellisenseBug.Demo instead of "this generator is not generating any files." message.

Actual Behavior:

• Everything works fine up until variable c11 is declared.
• Intellisense and syntax highlight is broken when c11 is declared, and never recover afterwards.
• Visual Studio reports errors in the Errors Window, but the build successfully passes
• Solution Explorer shows "this generator is not generating files." message instead of properly showing the generated file.

More details:

The source generator creates a single file with several empty C# classes named Class1, Class2, Class3 and so forth, depending on the number of classes declared in the consuming project in the first variable declaration:

• var classes = 5; means there will be Class1 to Class5
• var classes = 10; means there will be Class1 to Class10
• and so on.

Using <ProjectReference/> and <PackageReference/> to consume the source generator, in both cases the behavior is the same.