bug#2678: 23.0.91; vc-next-action in vc-dir acts strangely when only adds are necessary

[Dan Nicolaescu]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

  > > vc-register creates a call to vc-start-logentry
  > > vc-start-logentry calls vc-finish-logentry which calls vc-resynch-buffer
  > 
  > BTW, this trip via vc-start-logentry should be removed.  It's a remnant
  > from old times when vc-register had an opportunity to provide a message
  > linked to the file's addition, but nowadays it's just extra baggage that
  > makes the code less readable.

Note on this added to vc.el TODO.