Comment #2 on issue 3512 by [email protected]: [DOC]Eample in NR 5.5.5
Unpure-pure containers is misleading
http://code.google.com/p/lilypond/issues/detail?id=3512
The layout engine looks up some properties tentatively,
The list of "some properties" is currently:
vertical-skylines horizontal-skylines Y-extent
staff-staff-spacing staffgroup-staff-spacing default-staff-staff-spacing
nonstaff-relatedstaff-spacing staff-affinity
quantize-position staff-padding add-stem-support horizon-padding padding
stem-begin-position stem-end-position length
and anything user code looks up using ly:grob-pure-property
If we override any of these properties with a function, that function
must accept
both forms of argument list. The unpure-pure-container is a mechanism to
meet
this requirement.
That is not quite true. We can use a simple callback and the only loss is
that the property will be treated as unknown until layout is done.
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