#4852 Pianostaff vertical spacing wrong with cross-staff unbeamed tuplets

[Phil Holmes]

Rutger Hofman reported:

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.

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

rondoPiSU = \relative c'' {
     \time 2/4
     f,4( \tuplet 3/2 { e8) \change Staff = SU e,4 } \change Staff = ST |
}

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

Carl Sorenson added:

I believe this is a problem with cross-staff unbeamed tuplets. Change the final e,4 to e,8 e and all works well. But if we add \autoBeamOff, the same behavior is observed.