New in version 2.3.
Detach staff change marks attached to component:
abjad> piano_staff = scoretools.PianoStaff([])
abjad> rh_staff = Staff("c'8 d'8 e'8 f'8")
abjad> rh_staff.name = 'RHStaff'
abjad> lh_staff = Staff("s2")
abjad> lh_staff.name = 'LHStaff'
abjad> piano_staff.extend([rh_staff, lh_staff])
abjad> contexttools.StaffChangeMark(lh_staff)(rh_staff[2])
StaffChangeMark(Staff-"LHStaff"{1})(e'8)
abjad> f(piano_staff)
\new PianoStaff <<
\context Staff = "RHStaff" {
c'8
d'8
\change Staff = LHStaff
e'8
f'8
}
\context Staff = "LHStaff" {
s2
}
>>
abjad> contexttools.detach_staff_change_marks_attached_to_component(rh_staff[2])
(StaffChangeMark(Staff-"LHStaff"{1}),)
Return tuple of zero or more staff change marks.