Cross Voice Slurs

[Johannes Feulner]

I'd like to use cross voice slurs as in this example (note head color 
indicates voice):

I've found an old discussion from 7 years ago: 
https://lists.gnu.org/archive/html/lilypond-devel/2015-03/msg00288.html

Has anyone worked on this problem since or are there any new ideas? I'd 
volunteer to implement this feature.

Cheers,

Johannes

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Johannes Feulner
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