Include files in all projects

[sharwell]

Suppose you have a Project p which has a set of Documents D. Each document d in D has a set of linked documents L_d, each of which has a ProjectId. A union L can be formed from L_d for every d in D.

A Document d is included in all projects if L_d equals L. When L_d is a strict subset of L, a diagnostic should be reported and a code fix provided to include the document in the remaining projects (L - L_d).

Background

The .NET SDK has 6 projects representing the slightly different builds covering the supported target environments (.NET 3.5, .NET 4.0, .NET 4.5, Windows Store Apps, portable-net40, and portable-net45). It's easy for a developer to add a class to one of these projects and forget to add it to the remaining 5, which leaves some targets without the feature. This analyzer would detect the omission during development (for users running Visual Studio 2015), or during the CI build for a pull request at the latest.

[DonSchenck]

Thanks; this is important.