prefix from Windows extended-length paths is not supported #20
Description
Windows extended-length paths start with prefix \\?\ e.g. \\?\E:\...
I'd expect path_diff(PathBuf::from("\\?\C:\foo"), PathBuf::from("C:\bar") to return ../foo
This is an edge case we hit in our project, as a work around we strip the prefix isographlabs/isograph#583