Stefan Kangas <stefankangas@gmail.com> writes:

> Could you send an updated patch based on the above?

Patch is attached.

After some more testing I replaced:
(pcomplete-entries nil #'file-regular-p)
with:
(pcomplete-entries)

because the former makes it difficult to traverse directories to get to
the config file, and I've never seen pcomplete work like that anywhere
else.