We may want to have areas of the code hidden so the user can't see it. I have two current use cases: * I have a bunch of files in public to serve as part of the solution, but the candidate doesn't need to see them. This could also be solved for us by allowing us to collapse folders on load. * There are some files that provide code support as utility functions. We don't want them to concern themselves with what the code is doing and would prefer they couldn't navigate to the file at all.