#5142 partcombine can't handle simultaneous hairpins

[Palmer Ralph]

Rutger Hofman wrote :

I stumble into a partcombine bug. At times, \partcombine extends hairpins over (possibly long) stretches to the wrong terminating dynamic. In the top staff of the attached MWE, the erroneous behaviour is shown. The bottom staff group shows the intended behaviour. If I specify any of \partcombineApart or \partcombineChords, the bug disappears, second and third staves.

[Malte Meyn]

This is a duplicate of [#5143], isn’t it?

[Simon Albrecht]

I agree.

[Simon Albrecht]

A more condensed example by Kieren MacMillan:

\version "2.19.61"

musicA = {
  g'1\> R1\!
}
musicB = {
  b'1\> R1\!
}

\new Staff \partcombine \musicA \musicB