[Lilypond-auto] Issue 3734 in lilypond: NullVoice should not use transparent stencils

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Defect

New issue 3734 by address@hidden: NullVoice should not use transparent stencils
http://code.google.com/p/lilypond/issues/detail?id=3734

The behavior of NullVoice is often confusing (cf.  
<URL:http://lists.gnu.org/archive/html/bug-lilypond/2013-12/msg00089.html>).

It should really not turn stencils transparent but omit them completely.   
This has not been done so far since it

a) results in several warnings, like slurs not finding attachment points
b) restricts functionality, like forming attachment points for lyrics

The main question seems to be that of "attachment points" which could be  
addressed by using point-stencil rather than clearing stencils.  However,  
this again triggers collision avoidance.  So what seems to be rather wanted  
is that notes trigger NoteColumns (or similar) without placing stencils of  
their own, and omitted stencils like slurs don't even start looking for  
attachment points but short-circuit out of their calculations once they  
find their stencil being #f.

I am labelling this as "Defect" rather than "Enhancement" since the current  
NullVoice behavior is "as designed", but the design is not as much  
intentional as it is a concession to unresolved issues.

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