C-x v v no longer works the way it used to

[Jim Meyering]

Before the recent vc changes, in a version-controlled directory,
if I were visiting a non-version-controlled file and hit C-x v v,
it would effectively add that single file to the version control
system.  i.e., cvs add, git add, etc.

Now, all it does is print "No fileset is available here."

Is this intentional?
If so, how should one add a single file without resorting
to first marking it in dired mode.

To demonstrate, using git, I did this:

  mkdir k && cd k && git-init && touch a && git-add a && git-commit -m . &&
    echo x > new && emacs new

Then I typed C-x v v.

Same story using CVS.