bug#41821: 28.0.50; read-directory-name in vc commands should provide defaults from projects

[Eli Zaretskii]

> Cc: 41821@debbugs.gnu.org, juri@linkov.net
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Thu, 25 Jun 2020 21:13:13 +0300
> 
> >>> We are going in circles again.  Can you explain why vc-known-roots
> >>> cannot be moved to vc.el in its entirety?
> 
> Okay.
> 
> As I said, it will be (remain) a wrapper for project.el functions. If 
> that's okay with you, we can go ahead.

You mean, vc-known-roots is a wrapper for project-known-roots?  It was
okay with you to have that, so it's okay with me.