Persisting output files from source generators

Some time back, I had my own I/O code that based on some MSBuild property would persist my generated source for troubleshooting. This is no longer needed since you can now set

<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>

That will emit the sources to the $(IntermediateOutputPath)/generated/[GeneratorAssembly]/[GeneratorTypeFullName] folder by default. If you want to also change where the generated sources are placed, you can additionally set the CompilerGeneratedFilesOutputPath property.

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