Accidentals and Fingerings

[David Stocker]

Is there any reason why fingerings in these two chords should behave 
differently relative to the noteheads in their respective chords?

Incidentally, in the score I'm working on, the behavior of these two 
examples is reversed, with the "2" on the b in the first chord appearing 
closer to its notehead than the fingering indications in the upper voice 
are to theirs and I had to fix its position with \tweak. When I compiled 
this minimal example, I was surprised to see that the first example 
printed the way I would consider "normal" and the second chord requires 
manual positioning for the "1" on the b in the lower voice. This is 
interesting, no?


%%%%minimal example%%%%

\version "2.13"

\include "english.ly"

fingers = {
 \relative c {
   <ds-1 a'-3>4 r r2
   <fs-3 a!-1 d-2>4 r r2
 }
}

thumb = {
 \relative c {
   <b-2>4 r r2
   <b-1>4 r r2
 }
}

\score {
 \new Staff = "Guitar" {
   \clef "treble_8"
   \key d \major
   \time 4/4
   <<
     \new Voice = "fingers" {
   \voiceOne
   \set fingeringOrientations = #'(left)
   \override Fingering #'font-size = #-6
   \fingers
     }
     \new Voice = "thumb" {
   \voiceTwo
   \set fingeringOrientations = #'(left)
   \override Fingering #'font-size = #-6
   \thumb
     }
   >>
 }

%%%%end minimal example%%%%

\version "2.13"

\include "english.ly"

fingers = {
  \relative c {
    <ds-1 a'-3>4 r r2
    <fs-3 a!-1 d-2>4 r r2
  }
}

thumb = {
  \relative c {
    <b-2>4 r r2
    <b-1>4 r r2
  }
}

\score {
  \new Staff = "Guitar" {
    \clef "treble_8"
    \key d \major
    \time 4/4
    <<
      \new Voice = "fingers" {
        \voiceOne
        \set fingeringOrientations = #'(left)
        \override Fingering #'font-size = #-6
        \fingers
      }
      \new Voice = "thumb" {
        \voiceTwo
        \set fingeringOrientations = #'(left)
        \override Fingering #'font-size = #-6
        \thumb
      }
    >>
  }
}