[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5217 random results for the merge-rests-engraver regression test

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FWIW,
I looked through our regtests searching for { r4. } in simultaneous music and found only:
dot-column-rest-collision.ly
dots.ly
merge-rests-engraver.ly
rest-dot-position.ly

merge-rests-engraver.ly is the single one with three voices

I then modified rest-dot-position.ly :

mus = {
    r\longa. r\breve.
    r1. r2. r4.
    \once \override Rest.style = #'classical r4.
    r8. r16. r32. r64. r64.
}

vI =   \new Voice { \override Rest.color = #red    \voiceOne   \mus }
vII =  \new Voice { \override Rest.color = #green  \voiceTwo   \mus }
vIII = \new Voice { \override Rest.color = #cyan   \voiceThree \mus }
vIV =  \new Voice { \override Rest.color = #yellow \voiceFour  \mus }

{
    \set Score.timing = ##f
    \set Staff.instrumentName = #(lilypond-version)
    \mus
    \bar "" \break
    << \vI \vII >>
    \bar "" \break
    << \vI \vII \vIII >>
    \bar "" \break
    << \vI \vII \vIII \vIV >>
}

If you look at the output you see dots moving depending on \voiceXxxx
To make it more obvious colors are applied.

So far I the results are not random, though I always checked in-file and not running the regtests.
Maybe of some help, though.

Btw, some output is really poor, imho, see the dots for short rests in the outer voices.

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[issues:#5217] random results for the merge-rests-engraver regression test

Status: New
Created: Fri Oct 20, 2017 07:28 AM UTC by Knut Petersen
Last Updated: Sat Oct 21, 2017 10:58 AM UTC
Owner: Knut Petersen
Attachments:

• out-test-baseline-merge-rests-engraver.png (23.8 kB; image/png)
• out-test-merge-rests-engraver.png (23.7 kB; image/png)

There is some randomness in the placement of dots. The merge-rests-engraver.ly regtest (git-version557dc7) exposes the problem as the output might be one of the two attached pngs. The probability for both results is identical on my system.

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