This question is already buried in this post:
http://lists.gnu.org/archive/html/lilypond-devel/2009-08/msg00154.html
I'm starting a new thread to make it more visible.
Is it possible to write a scheme procedure to test if a given
context contains a particular engraver? Like...
(context-has-engraver? context 'Span_arpeggio_engraver)
This would have to return #t if a non-default engraver has been
added with \consists, and #f if a default engraver has been
removed with \remove. Or else it would be pointless.
Thanks.
- Mark
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