Staff/chords spacing.

[Matthias Hüsken]

Dear all,

I ran into another problem when updating my scores from 2.12 to 2.18 due 
to the changes in the vertical alignment calculation. What I have:

* a StaffGroup consisting of two Staffs
* a ChordLine in between

I want the two Staffs spaced evenly at the same distance (done, see 
below), and I'd like to have the ChordLine vertically centered between 
the two Staffs. Which I have not been able to do until now...

What I came up with: I'm breaking lines manually and set the distance 
between the staffs manually. I tried to set staff-affinity to CENTER to 
get the desired effect, but it does not seem to work. I'm using the 
following code at the moment:

\override VerticalAxisGroup.staff-affinity = #CENTER
\overrideProperty Score.NonMusicalPaperColumn.line-break-system-details
  #'((alignment-distances . (13.2 13.2)))
\break

Any idea what I am doing wrong or how I could fix it? Or should I use a 
different approach? I'd be grateful for pointers in the right direction...

Thanks,

Matthias