Issue 1680 in lilypond: Vertical spacing stretchability affects compressibility

[lilypond]

Status: Started
Owner: address@hidden
Labels: Type-Defect Priority-Medium Patch-new

New issue 1680 by address@hidden: Vertical spacing stretchability  
affects compressibility
http://code.google.com/p/lilypond/issues/detail?id=1680

%{ The LilyPond Notation Reference says:
    stretchability – a measure of the dimension’s
    relative propensity to stretch. [...]
    Note that the dimension’s propensity to compress cannot be directly set
    by the user and is equal to (basic-distance - minimum-distance).

   But in ver2.13.62, 'stretchability affects the ability to compress.

   The documented behavior would be nice for things like piano pedal lines
   where we want to disallow stretching, but allow compression to get out of
   the way of a few high notes on the next line.

   Patch at <http://codereview.appspot.com/4517136/>
%}

\paper {
  ragged-right = ##t
  paper-height = 80\mm
  system-system-spacing =
    #'((minimum-distance . 8) % move close when needed, please
       (basic-distance . 16)
       (padding . 1)
       (stretchability . 0))
}
{ % LilyPond gives warning of the collision,
  % but I wanted the first two systems to come closer instead
  g'1 \break g, \break g'''
}