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Issue 1618 in lilypond: unpredictable placement of rests

From: lilypond
Subject: Issue 1618 in lilypond: unpredictable placement of rests
Date: Sun, 17 Apr 2011 08:24:10 +0000

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

New issue 1618 by percival.music.ca: unpredictable placement of rests

This is split from issue 1609 (that issue was specifically about the problem we saw in partcombine-midi.ly)

As the examples below illustrate, placement of such rests still changes unpredictably. The score in example 2 produces different output with the two command lines
 lilypond test.ly
 lilypond test.ly test.ly
while version 2.12.3 produces the same output in either case. Both versions produce a warning "too many colliding rests". See also issue 1547 and issue 384.

The variation in position of the rests appeared somewhere between 2.13.48 and .54

The completion- engravers are not essential, it is simply the fact that LilyPond does not have a rule to place simultaneous rests with a note of different durations (see issue 1547). Smaller example, which produces different output depending on whether the file is alone on the command line or second in a list of .ly files:

\version "2.12.3"
\new Staff <<
  \new Voice {
    r1 r1
  \new Voice {
    c'2 e' g' b'
  \new Voice {
    r1 r1

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