Re: [Lilypond-auto] Issue 3512 in lilypond: [DOC]Eample in NR 5.5.5 Unpure-pure containers is misleading

[lilypond]

Comment #2 on issue 3512 by address@hidden: [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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