StaffSymbol: line-positions

[till Rettig]

How does the line-position property of the StaffSymbol work correctly? I get it 
set to different positions only if the staff is empty or the notes are on 
ledger lines. Is this behaviour implied? And does the list of the positions 
need a specific order? It obviously takes only as much arguments (positions) as 
there are staff lines defined, is that correct?

code with which I played:

\score{
\new Staff \with {
  \override StaffSymbol #' line-positions  = #' ( 18 12 2 0 -2 -4 )
  }{
  d d d d
} }


\score{
\new Staff \with {
  \override StaffSymbol #' line-position = #' ( 6 3 0 -3 -6 )
  }{
  d' e' f' g' c''
} }

In my idea the second example should print wider spaces and set the notes 
somhow off the lines, but it just prints the standard lines 4 2 0 -2 -4. Why is 
this so?

Thanks
Till
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