Bug-report: graces

[Heikki Johannes Junes]

I have used graces some times. They work quite nices, but the following
example produces (with 1.5.46) wrong ties. Comments within.

\score {
   \notes \context Voice = i {
       \grace a'8 ~ a'4 \grace a'8 ~ a'4
       % produces : a8( )a4( a8 )a4  
       % should be: a8( )a4 a8( )a4
   }
   \paper{ }
   \midi { \tempo 4 = 60  } 
   % midi produces : a2 (grace causes extra ties: a4 \grace a a -> a2 !?)
   % should produce: a4 a4 (two separate notes)
}

--
      Heikki Junes