Two voices in two different colors, which color wins in unisono part?

[Jürgen Ibelgaufts]

Hello everybody,

I have two voices, \voiceOne printed in black, \voiceTwo printed in red.
There are two measures with identical notes, chords and lyrics, that are
unisono. Here, the two voices use the same note heads with black stems up
and red stems down.

Now there is the funny effect that in the first measure, all note heads are
black, while in the first measure (with identical notes, as I said), all
note heads are read, except one that shows red!

Has anybody ever seen this before? Is there a way to determine in advance
which color shall win? Or, in other words, which voice to be printed first,
and which voice to be printed on top of the other?

Unfortunately, I could not manage to write a short demo, because no matter
what I tried, all the note heads always got printed black.

Thanks in advance
Jürgen
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