We all know that URL->wc copies are essentially checkouts that are scheduled for
addition. Well, I just noticed that if the URL is a single file, then instead
of driving a checkout-editor, we simply call RA->get_file(). The problem is
that this only gets textual contents, not the properties.
Really, to be consistent, we define a file's contents to mean *both* text and
props. If I copy a file under version control from one place to another, I
expect the whole thing to be copied, not just part of it.
Unfortunately, we need an RA interface for fetching props on a single path. I'm
going to mark this is an Alpha issue, since it has to do with completing a
feature that is already supposed to exist.