Bug? Vertical spacing algorithm changed? (lyrics move notes)

[Risto Vääräniemi]

Hi,

I just compiled a piece of music that I created earlier this summer
and I noticed that if I modify the minimum-Y-extent the lyric text
sometimes moves the following notes. I wonder if this is a deliberate
change or a bug?

The behaviour changed between 2.11.52 and 2.11.53.

I have attached two example images and the code (not very minimised
but hopefully understandable).

-Risto

%%%%%%
\version "2.11.48"

one = \relative c'
{
  r4 a a a
}

two = \relative c' \new Voice = "vTwo"
{
  c2  c
}

words = \lyricmode
{
  Something...
}

\score
{
  <<
    \new Staff = "sOne" { \one }

    \new Staff = "sTwo" { \two }

    \new Lyrics \with {alignAboveContext = "sTwo"}
      \lyricsto "vTwo" \words
  >>

  \layout
  {
    \context
    {
      \Lyrics
        \override VerticalAxisGroup #'minimum-Y-extent =
          %#'(-0.75 . 2.0) %% default values give normal results
          #'(-0.5 . 0.5) %% custom values don't
    }
  }
}
%%%%%%

lyrics_move_notes_52.png
Description: PNG image

lyrics_move_notes_53.png
Description: PNG image