I have a score on which I'm using showLastLength to only generate the
last ten bars. As I add bars and run Lilypond, every so often I get the
error below and the score won't build until I change the number of bars
for showLastLength. What is the error indicating? I had a quick look at
page.scm but I can't see why page layout should suddenly barf due to
starting output at some point into the score. LP 2.13.22 x86 on Linux:
"programming error: didn't find a vertical alignment in this system
programming error: system with empty
extent/usr/local/lilypond/usr/share/lilypond/current/scm/page.scm:244:68: In
procedure - in expression (- 0 y ...):"
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