More arpeggio strangeness

[Nick Payne]

This example has two identical bars, except that in the 2nd bar I've 
used a hack suggested by Keiren MacMillan to stop the arpeggios crowding 
up against the preceding notes. For some reason this doesn't have any 
effect on the final arpeggio. However, I've found that if I change the 
override for preceding stem to that one arpeggio to be \once \override 
Staff.Stem #'X-extent = #'(0 . 2.5), then it's appearance matches that 
of the others. I have no idea why a different override is required just 
for that one...

%==========================================
\version "2.13.4"
arpstem = \once \override Staff.Stem #'X-extent = #'(0 . 1.5)

treble = \relative c {
   d16\arpeggio <b' e> <b e> d,\arpeggio e\arpeggio <cis' a'> <cis a'>
       e,\arpeggio e\arpeggio <e cis'> <e cis'> e\arpeggio |
   d16\arpeggio <b' e> <b e> \arpstem d,\arpeggio e\arpeggio <cis' a'> 
<cis a'>
       \arpstem e,\arpeggio e\arpeggio <e cis'> \arpstem <e cis'> 
e\arpeggio |
}

bass = \relative c {
   g8.\arpeggio g16\arpeggio g8.\arpeggio g16\arpeggio g8.\arpeggio 
g16\arpeggio |
   g8.\arpeggio g16\arpeggio g8.\arpeggio g16\arpeggio g8.\arpeggio 
g16\arpeggio |
}

\score {
   <<
       \context Staff = guitar {
           \set Staff.connectArpeggios = ##t
           \clef "treble_8"
           \key d \major
           \time 3/4
           <<
               \context Voice = "1" { \voiceOne \treble }
               \context Voice = "4" { \voiceFour \bass }
           >>
       }
   >>
   \layout {
       \context {
           \Staff
               \consists "Span_arpeggio_engraver"
       }
   }
}
%==========================================

Nick
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