Problem solved after much deconstruction.
I am setting a string quartet. In this section almost every note has a
glissando, and some become to small to see. So I set this:
\override Glissando #'minimum-length = #5
\override Glissando #'springs-and-rods =
#ly:spanner::set-spacing-rods
This works fine to give the minimum length of the glissandi. It turns out
that this was forcing the score over the edge of the paper, not a rhythmic
error. Adjusting that solves the problem. It's only when there are a large
number of glissandi in the line that it occurs. I report this here in case
it may help future archive searchers.
I am also tempted to this this may be a lilypond bug. Why does lilypond not
break at a valid barline break in this sort of case? It seems the glissandi
are interfering with page breaking. I am not sure.
Andrew
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