Add support for "and all transitive dependencies" to .slnf file format

[rcmdh]

Currently, when a new reference is added to a project in a .slnf, Visual Studio complains and it doesn't work properly. It would be great to have an opt-in feature to automatically include all transitive dependencies. Ideally I would just specify the small number of projects I care about and all its dependencies would be pulled in automatically, rather than me having to maintain the list and update it periodically.

[KalleOlaviNiemitalo]

According to dotnet/msbuild#9159 (comment), feature requests for solution filters should be filed in Developer Community, rather than in GitHub.

https://developercommunity.visualstudio.com/t/Solution-filter-file-is-not-maintainable/1424434?ftype=idea&q=Solution+filter+reference&page=1 seems to match your request. https://developercommunity.visualstudio.com/t/Solution-Filter-should-provide-a-way-to/604799?ftype=idea&q=Solution+filter+reference also looks related.

Consider also using slngen to generate a solution file that lists the desired projects and their dependencies.