Issue 1140 in lilypond: StringNumber documentation

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Documentation Priority-Low

New issue 1140 by PhilEHolmes: StringNumber documentation
http://code.google.com/p/lilypond/issues/detail?id=1140

There have been requests for improved documentation of the StringNumber  
element.

http://old.nabble.com/Globally-removing-string-number-engraver-td7745355.html  
gives  
details of how to remove the StringNumber engraver.  This is used in  
the code below, which also provides a workaround that removes an error;  
this should be documented.

\version "2.13.18"
\layout {
  \context {
  \Staff
  \override StringNumber #'stencil = ##f
} }
{ <a\6-1>8 }

produces the error: cannot align on self: empty element
however, the pdf is produced correctly.

adding
\override StringNumber #'self-alignment-X = ##f
turns this error off.