Status: Accepted
Owner: ----
Labels: Type-Defect

New issue 3220 by [email protected]: partcombineChords affects preceding note and gives wrong output
http://code.google.com/p/lilypond/issues/detail?id=3220

Pavel Roskin reported here:

http://lists.gnu.org/archive/html/bug-lilypond/2013-03/msg00008.html

about a problem with partCombine. There are several open trackers for partCombine, but this appears to be a distinct problem.

Hello!

Following code gives incorrect output:


\version "2.16.1"
soprano = {
  \partcombineApart g'8 \partcombineChords g'8
}
alto = {
  c'16 [ c'16 ] c'8
}
\score {
  \partcombine \soprano \alto
}


The first c'16 is drawn without a beam, the second c'16 has its beam attached to the subsequent chord and has its stem up. It means that partcombineChords not only fails to produce the right output, but it affects the notes that precede it in time.

Replacing partcombineChords with partcombineAutomatic fixes the problem. That's weird because partcombineChords is meant to make chords only, and it fails at that, whereas partcombineAutomatic is a more complicated mode, and it makes a good looking chord.

It would be a real problem when the parts are separated by more than an octave. partcombineAutomatic would draw the notes separately. partcombineChords would be needed to produce a chord.

The problems exists both in the current development version and 2.16.1.

--
Regards,
Pavel Roskin


Attachments:
        partcombine-stem-chord.png  3.0 KB
        partcombine-stem-auto.png  2.9 KB

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