Bars after grace

[Rune Zedeler]

The bar number engraver does not check the grace-part of the 
time-moments and hence all bar-lines with main-timing=0 gets bar numbers.
How to correct this? (I.e. how do you know how long the current grace 
section is?)



\score {
    \context Thread \notes \transpose c'' {
        \property Score.BarNumber \override #'break-visibility = #all-visible
        c1 \grace {c8 d e f} \bar "|" c1
    }
}



-Rune