[Lilypond-auto] Issue 4205 in lilypond: Part combiner shifts or omits rests

[lilypond]

Status: Started
Owner: address@hidden
Labels: Type-Defect partcombine

New issue 4205 by address@hidden: Part combiner shifts or omits rests
https://code.google.com/p/lilypond/issues/detail?id=4205

The part combiner is sloppy about analyzing rests.  In some cases the  
output is merely ugly, but in others it actually omits rests, producing  
output that doesn't make musical sense.  (I have a patch in the works  
already, but I wanted to show the problem first.)

\version "2.19.15"

% rests of different durations beginning simultaneously, followed by
% unisilence
\score {
  \partcombine
    \relative f' { r4    r2 r8 r8 | r1 }
    \relative f' { r8 r8 r2 r4    | r1 }
}

% rests of different durations beginning simultaneously, followed by
% solo then a2.
\score {
  \partcombine
    \relative f' { r4   f2. | r8 f e2. }
    \relative f' { r8 d f2. | r4   e2. }
}

% mmrest and rest of different durations beginning simultaneously
\score {
  \partcombine
    \relative f' { r4 f2. | R1 }
    \relative f' { R1     | r4 d2. } % missing r4 is misleading
}


Attachments:
        part-combine-silence.ly  597 bytes

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