\grace at start of repeat block bug

[Richard Shann]

If you have a grace note at the start of a repeat, it is placed before 
the repeat, it should of course come after.
Here is an example (the \partial is used to force the presence of the 
begin-repeat bar). I have lilypond 2.6.5.

\score {
\context Staff \context Voice \notes  {
   \partial 8 e''8
   \repeat volta 2 {
   \grace b''8 ( ) a''4
   gis''4
   a''4
   c''8
   }  
}
\paper {}
}