PianoStaff vertical spacing messed up by tuplet

[Rutger Hofman]

Hello bug list,

I think I encountered a bug that is triggered under very specific 
circumstances. The lilypond program is included below. It sets the same 
line two times twice. The first time is OK. The second time, after the 
\break, makes the distance between the Staffs of the PianoStaff much too 
large. The second page repeats the same 2 lines, and the distance bug 
after the pageBreak is already triggered. This page shows that the 
spacing between PianoStaffs is unaware of the increased distance between 
the Staffs: unreadable because the PianoStaffs overlap.

Things to note:
- the first incantation works fine
- if the slur is removed, everything works fine
- if the tuplet is replaced with straight 8th notes, idem

I checked with version 2.18; the bug is identical.

Rutger Hofman
Amsterdam

\version "2.19.39"

\paper {
    ragged-right = ##t
    ragged-bottom = ##t
}

rondoPiSU = \relative c'' {
    \time 2/4

    % c2 |
    \change Staff = ST f,4( \tuplet 3/2 { e8) \change Staff = SU e,4 } 
| %599
}


\score {
    \new PianoStaff = PI <<
        \new Staff = ST {
            \rondoPiSU
            \break
            \rondoPiSU
            \pageBreak
            \rondoPiSU
            \break
            \rondoPiSU
        }
        \new Staff = SU {
            \clef bass
            s2*4 |
        }
    >>
}

bug-wide-page1.png
Description: PNG image

bug-wide-page2.png
Description: PNG image