[Lilypond-auto] Issue 2827 in lilypond: Add documentation in the Notation Manual about invisible grobs

[lilypond]

Status: Accepted
Owner: ----

New issue 2827 by address@hidden: Add documentation in the Notation  
Manual about invisible grobs
http://code.google.com/p/lilypond/issues/detail?id=2827

There are, in general, two types of invisible grobs in LilyPond:

1) "Container" grobs that help a set of grobs (usually in a list  
called "elements") align themselves.
2) "Blocking" grobs that shadow another grob (SpanBarStub to SpanBar, for  
example) or a group of grobs (LeftEdge to other stuff in a  
NonMusicalPaperColumn, for example) and block them from moving in a certain  
direction.

These are potentially problematic for users because they are unseen and  
therefore it is difficult to know how they work and how overrides relate to  
both them and the grobs with which they interact.

A section in the NR about these grobs should created, preferentially by  
someone who actually understands the art of documentation writing.