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

[Juri Linkov]

> Why not have some relevant history in VC itself?

Then like the project history currently is saved in ~/.emacs.d/projects
saving of a separate vc-directory history will be duplicated the same way
in e.g. ~/.emacs.d/vc-projects?

> Moreover, using a command such as "C-x v d" doesn't mean I want
> project.el record that, again because I might be using project.el
> commands for projects that aren't based on VC.

Then project.el could have a customizable variable that will prevent
recording vc project history.

> And if the history is collected by VC, it could be made available to
> project.el commands that call into VC, right?

You mean to record an internal vc-history separately from project.el,
but still to save it in the same project file ~/.emacs.d/projects?