Language service features don't work in WSL (Ubuntu 24) when a Windows C:\ file is open

[sean-mcmanus]

There is no warning or explanation for why the language service features aren't working.

The user may not realize the file has a C:\ path.

Editing shows logging: LSP: Request canceled by server (cpptools/getCompletionContext, code: -32000, id: 26): Failed to get the file context