tietools.is_in_same_parent

abjad.tools.tietools.is_in_same_parent(expr)

True when expr is a tie chain with all leaves in same parent.

That is, True when tie chain crosses no container boundaries, otherwise False.

Example:

abjad> t = Staff(RigidMeasure((2, 8), construct.run(2)) * 2)
abjad> Tie(t.leaves[1:3])

\new Staff {
      \time 2/8
      c'8
      c'8 ~
      \time 2/8
      c'8
      c'8
}

abjad> assert tietools.is_in_same_parent(t.leaves[0].tie.chain)
abjad> assert not tietools.is_in_same_parent(t.leaves[1].tie.chain)
abjad> assert not tietools.is_in_same_parent(t.leaves[2].tie.chain)
abjad> assert tietools.is_in_same_parent(t.leaves[3].tie.chain)

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