Replace VsctGenerator with a Roslyn source generator

[sharwell]

No description provided.

[madskristensen]

Thank you, Sam!!! I would love to put this in a NuGet package on the VsixCommunity org alongside a generator for .vsixmanifest files to replace the VSIX Synchronizer extension.

/cc @reduckted since I believe you've expressed interest in source generators in the past

[reduckted]

What a coincidence! Just the other week I tried writing a source generator as a replacement for VSIX Synchronizer (for both .vsct and .vsixmanifest files). It worked great, except when using it in projects that need to compile WPF classes.

I ran into this bug: dotnet/wpf#3404

I tried the suggested workaround of adding <IncludePackageReferencesDuringMarkupCompilation>true</IncludePackageReferencesDuringMarkupCompilation> to the extension's project file, but that didn't seem to make any difference. Perhaps because it's not using the .NET SDK to compile it? I never did get time to come back and debug it further. 😞

In any case, my intention was for it to end up as part of the VsixCommunity. The source generator I wrote wasn't incremental, but it might be a good starting point. If you'd like, I can add it to a new repository in the VsixCommunity and we can try to improve it?

[reduckted]

@madskristensen @sharwell
I've just created Community.VisualStudio.SourceGenerators in the VsixCommunity org.