New in version 2.0.
True when leaf crosses bar line:
abjad> t = Staff("c'8 d'8 e'8 f'8")
abjad> t[2].written_duration *= 2
abjad> contexttools.TimeSignatureMark((2, 8), partial = Duration(1, 8))(t[2])
TimeSignatureMark((2, 8), partial=Duration(1, 8))(e'4)
abjad> f(t)
\new Staff {
c'8
d'8
\partial 8
\time 2/8
e'4
f'8
}
abjad> leaftools.is_bar_line_crossing_leaf(t.leaves[2])
True
Otherwise false:
abjad> leaftools.is_bar_line_crossing_leaf(t.leaves[3])
False
Return boolean.