New in version 2.3.
Detach key signature marks attached to component:
abjad> staff = Staff("c'4 d'4 e'4 f'4")
abjad> key_signature_mark = contexttools.KeySignatureMark('c', 'major')
abjad> key_signature_mark.attach(staff)
KeySignatureMark(NamedChromaticPitchClass('c'), Mode('major'))(Staff{4})
abjad> f(staff)
\new Staff {
\key c \major
c'4
d'4
e'4
f'4
}
abjad> contexttools.detach_key_signature_marks_attached_to_component(staff)
(KeySignatureMark(NamedChromaticPitchClass('c'), Mode('major')),)
abjad> f(staff)
\new Staff {
c'4
d'4
e'4
f'4
}
Return tuple of zero or more key signature marks.