Hi,

I would like to ask for a bit of a guidance. I sometimes end up with
the scores as you see in the attachment. There's simply not enough
vertical space between staves and text is overlapping very badly.

I can attach the complete example (or perhaps come up with some
"\repeat unfold ..." trick to compose a full page that more or less
reproduces the problem), but it's basically the same type of scores as
I used anywhere else in
    https://github.com/mojca/frajtonarca/tree/master/tablature/avtorske

On the example in the screenshot you see the following elements in one stave:

- button names are two lines of Lyrics attached on top of the melody
- Voice with the main melody
- accordion push spanner
- RhythmicStaff
- FiguredBass

I didn't even try to touch the spacing inside the scores. The only
part where the code is messing up with vertical spacing is here:
    https://github.com/mojca/frajtonarca/blob/master/tablature/accordion.ily
in accordionPushSpannerEngraver (written by David Nalesnik) which is
something that I don't fully understand myself. But in theory it
should not affect distances between different staves, it should only
control the distance between main melody, push spanner event and the
basses.

I was looking at
- http://lilypond.org/doc/v2.19/Documentation/learning/vertical-spacing
- 
http://lilypond.org/doc/v2.19/Documentation/notation/flexible-vertical-spacing-paper-variables

etc. and found some ugly workarounds to fix the problem (I can create
a manual page break; add artificial invisible marks; increase the
spacing between staves – which will result in too big space even when
I don't have any button names / lyrics above the melody and that looks
ugly; ...), but I wonder if this issue with vertical spacing is:

(a) a bug in lilypond
(b) a bug in the code that handles accordion push events
(c) something that's super difficult to fix anywhere and I should be
using workarounds anyway

I can provide more information if needed, but I'll need a bit more guidance.

Thank you,
    Mojca
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