Issue 1565 in lilypond: Changing staff with manual beaming can give very long stems

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Critical Regression

New issue 1565 by address@hidden: Changing staff with manual  
beaming can give very long stems
http://code.google.com/p/lilypond/issues/detail?id=1565

In the code below, the music in the left hand changes from the bass clef  
line to the treble clef line.  The quavers are manually beamed.  There is a  
key sign with 6 sharps and the notes have naturals.  In this case, the  
beamed stems stretch to below the system under their proper system (In my  
real example, they actually go even further, to the top of the system below  
that).  This does not happen in 2.12.3 and was introduced between 2.13.51  
and 2.13.52.

{
  <<
    \new PianoStaff
    <<
      \new Staff = "PianoRH1"
      <<
        {
          \key fis\major
          \time 4/4
          \repeat unfold 4 { b'1 }
          ais'2 \voiceOne  fis'8 (  [  a8 dis'8 fis'8 )  ]  \oneVoice
          \repeat unfold 14 { b'1 }
        }
      >>
      \new Staff = "PianoLH"
      <<
        {
          \clef "bass"
          \key fis\major
          \time 4/4
          \repeat unfold 4 { dis1 }
          a,2 \voiceFour  d8 (  [  fis8 a8 \change Staff = "PianoRH1"  d'8  
)  ]  \change Staff = "PianoLH"  \oneVoice
          \repeat unfold 14 { dis1 }
        }
      >>
    >>
  >>
}


Attachments:
        LongStems2.13.52.png  17.9 KB
        LongStems2.12.3.png  18.1 KB