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Re: Bad \partcombine Output: Example

From: Graham Percival
Subject: Re: Bad \partcombine Output: Example
Date: Sun, 17 Jun 2007 13:08:08 -0700
User-agent: Thunderbird (Macintosh/20070509)

Hi Will,

If you create a _minimal_ example I'll add it to the bug tracker, but I
suspect that the answer will be that this is a duplicate of

- Graham

Will Oram wrote:
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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