The example from the manual regarding merging of rests (
http://lilypond.org/doc/v2.19/Documentation/notation/multiple-voices#merging-rests)
show a strange difference between whole measure rests and smaller rests.
The crotchet rest in bar one is placed in the middle of the staff whereas
the whole note rest in bar two is placed at the top (similar to the
placement of the \voiceOne rest in the unmerged staff). Is this intentional
or a bug? I would think that the correct placement would be in the middle
of the staff.


(In the snippet below I've added a third staff showing the rest placement
with a single voice in the staff. As expected lilypond places both rests
vertically centered in this staff)


\version "2.19.83"
voiceA = \relative { d''4 r d2 | R1 | }
voiceB = \relative { fis'4 r g2 | R1 | }

\score {
<<
\new Staff \with {
instrumentName = "unmerged"
}
<<
\new Voice { \voiceOne \voiceA }
\new Voice { \voiceTwo \voiceB }
>>
\new Staff \with {
instrumentName = "merged"
\consists "Merge_rests_engraver"
\consists "Merge-mmrests-engraver"
}
<<
\new Voice { \voiceOne \voiceA }
\new Voice { \voiceTwo \voiceB }
>>
\new Staff \with {
instrumentName = "single"
}
\new Voice { \voiceA }
>>
}

-- 
Jens Gyldenkærne Jensen
Korshøj 226
3670 Veksø
tlf: 2087 3360

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