That is for a ValueHint of Unknown. This is consistent with bash where
compgen -f is used in such cases. In long experience with completions
distributed with zsh, the worst thing you can do is break filename
completion as that's the minimum most user's expect.
Fixing the iteration over all_subcommands in zsh.rs. We deduplicate
values on (sc_name, bin_name) keys, but then only iterate on bin_name.
This doesn't cause problems now, since all bin names seem to be unique.
However, without fixing this, the next commit would have started
generating duplicated functions with same names.
For example, with an #[long = "foo", visible_alias = "bar"] subcommand,
we'll end up with 2 pairs: [("foo", "foo"), ("bar", "foo")]. Before this
commit, we would have ended up generating _my-app__foo_commands()
functions. These functions should have identical content, so it is not
an error, just an inefficiency that we can fix.
