Comment #4 on issue 2253 by [email protected]: Markup in separate
voices in \partcombine results in "stacked" markup.
https://code.google.com/p/lilypond/issues/detail?id=2253
If the content is identical but the direction differs, are they mergeable?
I'm not sure about cases where direction is explicitly set differently. But
when direction is not specified I'd say that they should in general be
mergeable.
Does merging mean showing one and omitting the other, or something more
complicated?
Is "omitting" removing the visual representation? Of course merging should
*not* change the structure. Well, with markups there isn't anything beyond
the visual, but see below.
Are there other ways besides partcombine that two markups might end up in
the same place at the same time and need to be merged?
Hm, difficult question. I think identical markups can happen with regular
parallel music, i.e. << \musicOne \musicTwo >>. Whether this should be
automatically mergeable? Can't say.
Are there things other than markups that should also be considered?
Yes, definitely: Dynamics. When parts are merged unisono or as chords
duplicate dynamics are merged to one, but when music is merged "apart"
identical dynamics are printed twice, above and below. In general this is
extremely undesirable.
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