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Bad \partcombine Output: Example

From: Will Oram
Subject: Bad \partcombine Output: Example
Date: Fri, 15 Jun 2007 00:36:15 -0500

Earlier (see http://lists.gnu.org/archive/html/bug-lilypond/2007-06/ msg00046.html), I described very ugly output when using partcombine in lilypond .11.21 to the current day. Parts took no heed of each other and proceeded to overlap and create a trainwreck.

After a LOT of ripping apart code, I've come up with a reason and an example.

REASON: Grace notes! When grace notes occupy the same space, it causes a partcombine meltdown.

Try this. In reading the output, note measure two: a quarter and dotted half occupy the same beam, and slurring looks plain wrong.

\include "english.ly"

partA = \relative c''' {
        \clef "treble"
        c2 d\trill \bar "" \grace { c16[( d]) } \bar "|"
        cflat2.( c4)
        dflat2 r
partB = \relative c'' {
        \clef "treble"
        c d2_\trill \bar "" \grace { c16[( d]) } \bar "|"
        eflat4( f8 gflat aflat4 gflat)
        f2 r

\score {
        \new Staff <<

\layout {

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