bug#2944: 23.0.91; vc-dir confusing at startup

[Dan Nicolaescu]

Richard M Stallman <rms@gnu.org> writes:

  > I just ran vc-dir for the first time.  It worked -- after a while.
  > However, at first it displayed just a few lines of info
  > about the overall VC handling of the directory.  It seemed
  > to be doing the wrong job.
  > 
  > So I started to wonder if that were the wrong command.
  > I looked at the doc string and it did not clarify the question.
  > It says it "shows the VC status for DIR".  The few lines
  > that were displayed seemed to fit that description.
  > 
  > Eventually the info on files did appear.  But this is a bug anyway.
  > 
  > I think the doc string should be fixed, and the buffer should
  > start out containing explanatory text such as
  > "The status of files is being computed
  > and will be displayed here when that is done."

The problem with not showing something in VC buffer is a common one for
asynchronous VC commands (diff, log).  The solution we have in emacs-23
for that is to add [Working...] on the modeline while such command is in
progress.  Was that not obvious enough?  Does the face for that message
need to stand out a bit more?

Please feel free to fix the doc string the way you want it.