[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #4684 Kneed beam group should keep ‘main beams’

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If anyone is interested: I managed to extend the deadline of my master's composition a bit further, so in case anyone is up for tackling this issue, the bounty will be active until the 15th of April.

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[issues:#4684] Kneed beam group should keep ‘main beams’

Status: Accepted
Labels: Bounty
Created: Mon Dec 07, 2015 09:19 PM UTC by Simon Albrecht
Last Updated: Sun Jan 31, 2016 10:14 AM UTC
Owner: nobody
Attachments:

• 16.png (9.2 kB; image/png)
• 55.png (10.5 kB; image/png)
• staircase.png (8.7 kB; image/png)

Reported by Gilberto Agostinho.

If the number of beams in a kneed group changes, the result may become very difficult to read: Lily doesn’t keep one main beam and place the side beams sensibly, but instead decides from distance to the note head on each new note, with odd results:

%% staircase.ly %%%%%%%
\version "2.19.32"
\autochange {
   c'''64[ c c32
   \repeat unfold 6 {c'''64 c c32}
   c'''64 c c32]
}

See the other two attachments for other examples of current output vs. better arrangements, as well as the mailing list threads (user and bug).
Elaine Gould’s esteemed opinion is referenced in http://lilypond.1069038.n5.nabble.com/Kneed-beams-and-changes-of-staff-tp184339p184472.html.

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