autotablature does not work?

[Karl Berry]

I'm trying to typeset tablature for mandolin, which is tuned g-d-a-e (g
below middle c to the e at the top space of the treble staff).

In lilypond 1.6.6, something is apparently going wrong with the
automatic string selection -- it always chooses the top string.  For
instance, with the input below, I get tablature indicating frets 0, 7,
14, and 21 respectively, all on the top string.  It should be fret 0 on
each of the four strings in succession.  (The staff output is correct.)

This used to work in previous versions.

Help?

Thanks,
karl


\version "1.6.6"

part = \notes {
  g d' a' e''
}

\score {
  \context StaffGroup <
    \context Staff <
      % Hide fingering number
      \property Staff.Fingering \override #'transparent = ##t
      \part
    >
    \context TabStaff <
      \outputproperty #(make-type-checker 'staff-symbol-interface)
                      #'line-count = #4
      \property TabStaff.stringTunings = #'(-5 2 9 16)
      \part
    >
  >
}