Fix issue 1376 ambitus two accidentals. (issue4099044)

[n . puttock]

LGTM.




http://codereview.appspot.com/4099044/diff/1/input/regression/ambitus.ly
File input/regression/ambitus.ly (right):

http://codereview.appspot.com/4099044/diff/1/input/regression/ambitus.ly#newcode8
input/regression/ambitus.ly:8: Two noteheads are displayed even for a
note with two different
Tthe noteheads are printed in overstrike, so there's only one visible;
the accidentals are prevented from colliding.

http://codereview.appspot.com/4099044/diff/1/input/regression/ambitus.ly#newcode30
input/regression/ambitus.ly:30: \new Staff \relative c'{
c' {

http://codereview.appspot.com/4099044/diff/1/lily/ambitus-engraver.cc
File lily/ambitus-engraver.cc (right):

http://codereview.appspot.com/4099044/diff/1/lily/ambitus-engraver.cc#newcode184
lily/ambitus-engraver.cc:184: && !((p.steps () == other.steps ())
indent

http://codereview.appspot.com/4099044/diff/1/lily/ambitus-engraver.cc#newcode185
lily/ambitus-engraver.cc:185: && (p.get_alteration () !=
other.get_alteration ())))
indent

http://codereview.appspot.com/4099044/