\repeatTie problem with lyrics

[Peter Dingley]

%{
  > I'm not top posting.

  This file compiles correctly with the repeats unfolded
  but doesn't appear to handle the \repeatTie for the lyrics
  correctly when the repeats are folded. Without lyrics there
  are no problems with or without folded repeats.

  address@hidden (Tues, 19 Jan 2010)
  MacOS X 10.4.11 (G4)
%}

\version "2.12.3"
\paper{ ragged-right=##t }

%\unfoldRepeats

\relative c'
{
  \repeat volta 2
  {
    c d e f~ |
  }
  \alternative
  {
    { f a b c }
    { f, \repeatTie g a c }
  }
}

\addlyrics
{
  \repeat volta 2
  {
    c d e f 
  }
  \alternative
  {
    { a b c }
    { g a c }
  }
}