Restored files don't get classification until scroll or document change

[davidwengier]

Repros with and without devkit. Also repros with Razor files (with cohosting on)

Repro steps:

1. dotnet new console
2. code .
3. Open Progam.cs
4. Close VS Code
5. code .

Actual behaviour:

Console is blueish until the document is scrolled, or changed, or presumably any other change that causes a project change of some kind

Expected behaviour:

Once fully loaded, Console should be greenish.

[davidwengier]

Thanks for the pointers!