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空の譜が省略された楽譜で MarkLine を使用する

空の譜が省略された楽譜 (Frenched score) で MarkLine コンテキスト (LSR1010) を使用すると、2 つの MarkLine に挟まれた全ての譜が省略された場合に問題が生じます。StaffGroup 内で Keep_alive_together_engraver を使用し、グループ内の譜のどれかが残っている場合にのみ MarkLine を残しておくようにします。

bars = {
  \tempo "Allegro" 4=120
  s1*2
  \repeat unfold 5 { \mark \default s1*2 }
  \bar "||"
  \tempo "Adagio" 4=40
  s1*2
  \repeat unfold 8 { \mark \default s1*2 }
  \bar "|."
}
winds = \repeat unfold 120 { c''4 }
trumpet = { \repeat unfold 8 g'2 R1*16 \repeat unfold 4 g'2 R1*8 }
trombone = { \repeat unfold 4 c'1 R1*8 d'1 R1*17 }
strings = \repeat unfold 240 { c''8 }

#(set-global-staff-size 16)
\paper {
  systems-per-page = 5
  ragged-last-bottom = ##f
}

\layout {
  indent = 15\mm
  short-indent = 5\mm
  \context {
    \name MarkLine
    \type Engraver_group
    \consists Output_property_engraver
    \consists Axis_group_engraver
    \consists Mark_engraver
    \consists Metronome_mark_engraver
    \consists Staff_collecting_engraver
    \override VerticalAxisGroup.remove-empty = ##t
    \override VerticalAxisGroup.remove-layer = #'any
    \override VerticalAxisGroup.staff-affinity = #DOWN
    \override VerticalAxisGroup.nonstaff-relatedstaff-spacing.padding = 1
    keepAliveInterfaces = #'()
  }
  \context {
    \Staff
    \override VerticalAxisGroup.remove-empty = ##t
    \override VerticalAxisGroup.remove-layer = ##f
  }
  \context {
    \StaffGroup
    \accepts MarkLine
    \consists Keep_alive_together_engraver
  }
  \context {
    \Score
    \remove Mark_engraver
    \remove Metronome_mark_engraver
    \remove Staff_collecting_engraver
  }
}

\score {
  <<
    \new StaffGroup = "winds" \with {
      instrumentName = "Winds"
      shortInstrumentName = "Winds"
    } <<
      \new MarkLine \bars
      \new Staff \winds
    >>
    \new StaffGroup = "brass" <<
      \new MarkLine \bars
      \new Staff = "trumpet" \with {
        instrumentName = "Trumpet"
        shortInstrumentName = "Tpt"
      } \trumpet
      \new Staff = "trombone" \with {
        instrumentName = "Trombone"
        shortInstrumentName = "Tbn"
      } \trombone
    >>
    \new StaffGroup = "strings" \with {
      instrumentName = "Strings"
      shortInstrumentName = "Strings"
    } <<
      \new MarkLine \bars
      \new Staff = "strings" { \strings }
    >>
  >>
}