Apply tie spanner to left leaf and right leaf:
abjad> staff = Staff(notetools.make_repeated_notes(4))
abjad> tietools.TieSpanner(staff[:2])
TieSpanner(c'8, c'8)
abjad> f(staff)
\new Staff {
c'8 ~
c'8
c'8
c'8
}
abjad> tietools.apply_tie_spanner_to_leaf_pair(staff[1], staff[2])
abjad> f(staff)
\new Staff {
c'8 ~
c'8 ~
c'8
c'8
}
Handle existing tie spanners intelligently.
Return none.
Changed in version 2.0: renamed tietools.span_leaf_pair() to tietools.apply_tie_spanner_to_leaf_pair().