Comment #14 on issue 984 by [email protected]: Noteheads don't merge when one of the voices contains a second
http://code.google.com/p/lilypond/issues/detail?id=984
It might be harder than you think. The current code is a total mess that for most decisions only consults the properties of the extremal note heads. This only works where all noteheads on a stem are actually identical. Which is the most common case, but definitely the only one. The loop over the noteheads will not be correct in several cases where there are multiple noteheads, not all of them mergeable.
I am taking so long not because I am just adding a "missing part": that one is actually pretty easy. But because the whole thing needs rewriting. I am not interested in getting a higher number of cases right by accident. So that needs some work, some more stuff needs to get pulled into the loop, and I need to consult the _corresponding_ noteheads for information about merging. Which means that I have to sort not just the notehead coordinates but rather the whole notehead info.
And so forth and so on. I don't like leaving code where I can just write down a number of regtests that will fail under it.
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