Determine if a stem is present

[Urs Liska]

Hi all,

I want to know if a given notehead has a stem attached. Obviously even
whole notes do have a stem object, but with zero extent.

I've found the following calculation to be reliable, but I can't imagine
it has to be so complicated:

    (if (or (= +inf.0 (car stem-y-extent))
            (= -inf.0 (car stem-y-extent))
            (= +inf.0 (cdr stem-y-extent))
            (= -inf.0 (cdr stem-y-extent)))

(with stem-y-extent being the Y-extent property of the stem object).

I think there should be some property I can ask directly about this? But
I didn't find any suspicious entry for Stem or stem-interface.

Any suggestions?
Urs

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