hshift a rest in a triplet not possible?

[Eluze]

Pierre Perol-Schneider reports this problem on the French LilyPond forum:

shifting the rest in a triplet doesn't work

\version "2.17.11"

Aigu = {
        \time 3/4
        \key e \minor
        e'4 e' e' | %1
        e'4 e' e' | %2
        s4 %...
}
Medium = {
        \time 3/4
        \times 2/3 { a8\rest b g } 
        \times 2/3 { a8\rest b g } 
        \times 2/3 { a8\rest b g } | %1
        \times 2/3 { a8\rest b g } 
        \times 2/3 { a8\rest b g } 
        \times 2/3 { a8\rest b g } | %2
        s4 %...
}
Basse = { 
        \stemDown
        \time 3/4
        \key e \minor
        e,2. | %1
        \once\override NoteColumn #'force-hshift = #-1
        e,2. | %2
        s4 %...
}
\score {
  <<
    \new Staff = "Partition" <<  
        \clef "treble_8"
        \new Voice = "Aigu" { \voiceOne << \Aigu >> }
        \new Voice = "Medium" { \voiceTwo << \Medium >> } 
        \new Voice = "Basse" { \voiceThree << \Basse >> }
    >>
  >>
  \layout { }
}

if instead of a8\rest in the Medium voice you have a real note, shifting is
perfect.

reading in Internals I found:

2.2.97 Rhythmic column engraver
Generate NoteColumn, an object that groups stems, note heads, and rests.

is this a bug with the documentation or rests or triplets?

Eluze



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