C# Method Syntax format grammar recognition

[alexr00]

From @CCludts on January 3, 2019 5:47

The method name is only recognized as source.cs instead of storage.type.cs when formatting function signatures in certain cases.

public class Hello {
    // correct syntax highlighting
    public Task<(string users, string missingUserIds, string unprocessedUserIds)> FetchUsers() {
        return null;
    }

    // different formatting. breaks syntax highlighting
    public Task<(
            string users,
            string missingUserIds,
            string unprocessedUserIds)> FetchUsers() {
        return null;
    }
}

Copied from original issue: Microsoft/vscode#65951

[DustinCampbell]

This is a duplicate of https://github.com/dotnet/csharp-tmLanguage/issues/63.