revitalizing a whole GrandStaff if only one Staff is alive

[Eluze]

I suggest to add 

after NR: /Hiding staves/ a section should be added to explain how to keep
alive a full GrandStaff even if only one of its staves is alive

*Showing the full GrandStaff if only one Staff is playing*

if one instrument of a GrandStaff is playing, sometimes it is better to
display /all/ the instruments (staves) of the GrandStaff

with \removeEmptyStaves in the Staff context and \consists
Keep_alive_together_engraver in the GrandStaff context the whole GrandStaff
(and not only a single, non-empty Staff) is displayed

-- snippet 
% (the shortInstrumentName is added to easily spot where which staff is
alive)

\score{
  \relative c' <<
    \new StaffGroup = "StaffGroup_woodwinds" <<
      \new Staff = "Staff_flute" \with { shortInstrumentName = "Fl"} \repeat
unfold 20 { c'4 c c c }
      \new Staff = "Staff_oboe"  \with { shortInstrumentName = "Ob"} \repeat
unfold 20 { b4 b b b }
    >>
    \new StaffGroup = "StaffGroup_Strings" <<
      \new GrandStaff = "GrandStaff_violins" \with { shortInstrumentName =
"Vi"} <<
        \new Staff = "Staff_violinI" { \repeat unfold 19 { s1 } a -"this
note to revive the staff" }
        \new Staff = "Staff_violinII" { \repeat unfold 20 { s1 } }
      >>
      \new Staff = "Staff_viola" \with { shortInstrumentName = "Va"} \repeat
unfold 20 { \clef alto e4 e e e }
      \new Staff = "Staff_cello" \with { shortInstrumentName = "Ce"} \repeat
unfold 20 { \clef bass c,1 }
    >>
  >>
}
\layout {
  \context {
    \GrandStaff
    \consists Keep_alive_together_engraver
  }
  \context {
    \Staff
    \RemoveEmptyStaves
  }
}

-- endsnippet

thanks to Alex Voice for his example and for your comments!
Eluze



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