#5547 Grand Comprehensive Subdivided Beams Issue

[Simon Albrecht]

This serves as a reference to all the preparations and deliberations Urs (and others) have made for fixing/reimplementing beam subdivision.

The topic has been discussed here and here.

[Simon Albrecht]

Related issues: [#1515] [#2361] [#2474] [#4738] [#4739] [#4740] [#4919]

[Urs Liska]

Attached is the work I have spent analyzing the issue.

I want to stress that this is also related to wrong handling of tuplets, whose fix is sort of a prerequisite to get beam subdivisions right.

[Urs Liska]

\relative {
  \tuplet 3/2 2 { c'4 d8 e f4 } g2
}

shows what I mean: The middle triplet is broken (not beamed), obviously because LilyPond does not consider the group as a "virtual" 3/4 measure with a 2 2 2 grouping, but as 2/4 of a 4/4 measure where the possible break point is at the "real" beat.