hi list, I have the following problem: in ancient music there are no real ledger lines, but the staff is expanded by lines, spanning more notes (or rests). LilyPond can do that with StaffSymbol #'line-positions, but when I combine it with a score laid out in mensurstrich format, I can see that extent of the mensurstriche are miscomputed (as if the involved staves kept their centre). see the attached example.
I 'fixed' this by the attached patch, but that does not solve the whole problem: now the extents are right, but the absolute position is as if the uppermost staff kept its centre - which is fine as long as there's no extra line there. I believe this is caused by Span_bar::print having a different common refpoint than the context the result is used in, but I couldn't track it further. any help and hint is welcome. p
spantest.ly
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patch17
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