Include completion doesn't work for subfolders under the Kernel framework directory on Mac

[sean-mcmanus]

I'm not sure what is special about that case or if it repros with other scenarios/folders.

#include <Kernel/

Repro is like that -- one folder can be completed like "sys", but after that the completions show no results.

Other features like the Add '#include' code actions work correctly for those cases and I see the files under there being tag parsed.