Comment #9 on issue 1056 by n.puttock: Pure-height of stems does not
accurately estimate height
http://code.google.com/p/lilypond/issues/detail?id=1056
It's measured in half staff-spaces, so the default length is 7 (i.e., 3.5
staff-spaces).
calc_length () is what 'length is set to by default via the method's
exported form in
scheme: ly:stem::calc-length (see scm/define-grobs.scm for the definition
of Stem).
So when 'length is read, unless the user has overridden the property,
calc_length ()
is ultimately called to get the return value.
To check whether 'length has been set by the user, you can use
get_property_data (),
which just peeks at the callback without actually evaluating it.
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