I think this is a bug. The following code when run in plain lilypond
produces an error message:
warning: note head `noteheads-2transparent' not found:
c d e f g \inv
a \unv b c
But does produce output. That output is also flawed, in that the stem
of the invisible note is visible as two vertical dashes.
Version 2.1.28 (CVS ChangeLog 1.1795)
inv = {
\override Staff.NoteHead #'style = #'transparent
\override Stem #'transparent = ##t
\override Accidental #'style = #'transparent
}
unv = {
\override Staff.NoteHead #'style = #'default
\override Stem #'transparent = ##f
\override Accidental #'style = #'default
}
\score {
\notes {
c d e f g \inv a \unv b c
}
}
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