Fingering placement problem

[Nick Payne]

In a chord containing a second, if I place the fingering above the notes 
to avoid having the fingering numerals overlapping each other (see 
https://code.google.com/p/lilypond/issues/detail?id=2541), then the 
numerals default to being placed much higher above the noteheads than is 
normal or if either of the notes in the second is omitted from the chord:

\version "2.15.43"

\relative c'' {
    \set fingeringOrientations = #'(left)
    \override Fingering #'staff-padding = #'()
    \override Fingering #'add-stem-support = ##f
    <d-0 c-3 f,-0>4 <d^0 c^3 f,-0> <d^0 f,-0> <c^3 f,-0>
}

test.png
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