On 9 Jul 2016 I submitted a report titled: Problem coloring Ambitus
ledger-lines. A work-around quickly came (thanks Thomas Morley)
consisting of inserting the following code at the beginning of the music:
\once \override Staff.LedgerLineSpanner.color = #grey
\grace s128
\stopStaff \startStaff
I pointed out an immediate problem with that code that was given a
further work-around (thanks Simon Albrecht) involving specifying the
instrumentName in a \with block instead of using a \set command.
The following code:
\version "2.19.53"
S = {
\once \override Staff.LedgerLineSpanner.color = #grey
\grace s128
\stopStaff \startStaff
R1*3 % 1-3
\grace c'128
c'1 c''' % 4
}
\score {
\new Staff { \compressMMRests \S }
\layout { \context { \Staff \consists "Ambitus_engraver" } }
}
shows two more problems with the suggested work-around, namely:
* as written the initial MM rests are not compressed , i.e., the
\compressMMRests command has no effect.
* if the line containing the three rests is removed, then the
compilation fails with the following assertion failure:
Interpreting
music.../home/gub/NewGub/gub/target/darwin-x86/src/lilypond-git.sv.gnu.org--lilypond.git-release-unstable/lily/sequential-iterator.cc:163
<0>: failed assertion `!grace_fixups_ || grace_fixups_->start_ >= here_mom_'
and no output is obtained.
Hopefully, someone will have work-arounds for these two problems.
I would also be interesting in knowing why the Ambitus ledger lines are
handled is such a different manner than, say, the AmbitusNoteHead, which
doesn't give rise to any of these problems. The amount of time I have
spent dealing with problems arising from the original work-around must
number in the dozens of hours.
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