Support solution filters (*.slnf)

[sharwell]

Addresses dotnet/roslyn#47531 (review)

[Davilink]

Any update ?

[ffMathy]

Any news?

[JoeRobich]

@sharwell Thanks Sam! These changes merged as part of #4481

[MostHated]

I am not familiar with solution filter, but came across it when vscode omnisharp was not respecting my folder excludes. Is there an example somewhere of how I might use it to filter out a particular folder?

[JoeRobich]

@MostHated Here are the docs https://docs.microsoft.com/en-us/visualstudio/msbuild/solution-filters?view=vs-2019. Solution filters are for filtering out projects that would normally be loaded as part of a Solution file (.sln).