Vertical spacing of Lyrics messed up by system-system-spacing.basic-distance

[Risto Vääräniemi]

Hi,

I'm trying to add some space between systems with
system-system-spacing.basic-distance inside the \paper block. In some cases
the basic-distance gives more uniform spacing than the padding.

However, it seems to mess up the vertical spacing of lyrics placed above a
staff. There seems to be too much space between the lyrics and the staff.
That doesn't affect the first staff but the next ones. The minimum-distance
does the same. Setting stretchability to 0 has no effect. I've attached an
image and an example.

If there are lyrics only on top of the staff the issue can be seen even
without modifying the basic-distance. The default value #12 is enough to
trigger this. If it is set to a much smaller value the spacing is OK. I'm
sorry if my example is confusing. I tried to cover both cases—with one and
two lines of lyrics.

Am I just missing something obvious? I tried to search for a similar bug
but found none so far.

BR,
Risto

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​

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\version "2.19.18"

\paper {
  ragged-right = ##t
  indent = #0

  % If this is commented out, the top lyrics spacing is OK with lyrics
  % above and below the staff.
  system-system-spacing.basic-distance = #20
}

melody = \relative c' \new Voice = "melody" {
  c4 c c c \break c4 c c c
}

testLyrics = \lyricmode {
  Aa aa aa aa. Aa aa aa aa.
}

<<
  \new Staff = "SI" <<
    \melody
  >>
  \new Lyrics \with {alignAboveContext = "SI"} \lyricsto "melody"
\testLyrics
  % If this is commented out, the default value is enough to trigger the
spacing issue.
  \new Lyrics \lyricsto "melody" \testLyrics
>>