Comment #1 on issue 3198 by [email protected]: alterBroken doesn't work
for properties accessed before line breaking
http://code.google.com/p/lilypond/issues/detail?id=3198
Transferring my replies to the post on bug-lilypond to the tracker...
When you use variables, you need to quasiquote them:
\alterBroken #'direction #`(,UP ,DOWN) Staff.DynamicLineSpanner
Or, less awkwardly, use the numbers these variables stand for:
\alterBroken #'direction #'(1 -1) Staff.DynamicLineSpanner
This eliminates the warning which the original snippet creates:
warning: an outside-staff object should have a direction, defaulting to UP
However, it doesn't result in different placement for the two parts of the
broken hairpin.
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