Re: mensural notation improvements (issue3797046)

[Benkő Pál]

> I'll try to find an example where a non-final square note is
> dotted and the following note is below it (in the linked examples
> the next notes are above, so the dot of the first note appears
> _below_ the next note).

at last I got to it and found three examples:
two from Brussels 9126 (la Rue: Missa L'homme armé
and la Rue: Missa O sacer Anthoni), and one from Chigi
(Ockeghem: Missa De plus en plus).  sorry for the quality.

p

de-plus-11.jpg
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lommearme.jpg
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osaceranthoni.jpg
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