implode should merge into voice 2 and 3 also
When imploding a staff with several voices, the implode function tries to merge the voices into fewer voices where ever possible. Except that it actually only tries to merge voices with voice 1. If voice 2 and 3 have the same rhythm , different from voice 1, they are not merged.
The proposal of this ticket is that also lower voices should be merged, even when not possible to merge with voice 1.
Before a merge of three staves:
The result after doing implode twice, and also what I would have expected (but did curretly not happen):
The same result, but with voice coloring highlited: