global accel./rit./string. with TextSpanner

[Wolfgang Suppan]

hi,

I'm adding a global voice for global (all instruments/voices in the score) 
tempo changes like accel. or rit. with a TextSpanner to indicate with a
dashed line the duration of the modifycation. this work somehow ( a little
bit tricky using padding to bring the tempo mark and the TextSpanner on the
same Y-level)
my example below shows what happens when I use RemoveEmptyStaffContext...–
the TextSpanner disappear when the upper voice is not visible – only the
tempomark.

1. is there solution with TextSpanner and RemoveEmptyStaffContext
2. would it be better to add a new dashed-line-extention-possibilty for: 
\mark "accel." (duration of the dashed line could be specified like 1*3 = 3
whole notes...)

thanks,

wolfgang suppan



%%%start

\version "2.10.20"


% bar1 tempo = 60 accel._ _
% bar2 (accel.)_ _ _
% bar3 (accel.)_ _ _
% bar4 tempo = 80 rit._ _ _
% bar5 tempo = 60

global = {
  \override TextSpanner #'shorten-pair = #'(4 . 5)
  \override TextSpanner #'Y-offset = #7.9
  %\override TextSpanner #'font-size = #1
  \override TextSpanner #'font-shape = #'upright
  \override Score.MetronomeMark #'padding = #5.5

  \tempo 4 = 60
  \once \override TextSpanner #'edge-text = #(cons (markup #:line ("accel."
#:hspace 0.0)) "")
  s1 \startTextSpan \break
  s   \break
  \once \override Score.MetronomeMark #'padding = #5.5
  \tempo 4 = 80
  \once \override TextSpanner #'edge-text = #(cons (markup #:line ("rit."
#:hspace 0.0)) "")
  s \stopTextSpan \startTextSpan \break
  s \break
  \tempo 4 = 60
  s \stopTextSpan}


musica = {a''1 a'' R  R   a''}
musicb = {b'1  R   b' R   b'}
musicc = {c'1  R   R  c'  c'}

\score {
  <<
  \new Staff {<< \global \musica >>}
  \new Staff \musicb
  \new Staff \musicc
  >>

\layout { 
\context { \RemoveEmptyStaffContext } %remove this line to compare the
result
}
}
%%%end
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