Arpeggios with arrows across voices

[Nick Payne]

In the section of the NR dealing with arpeggios, there is nothing under 
known issues and warnings regarding arpeggioArrowUp and 
arpeggioArrowDown not working to get arrowed arpeggios across voices. 
The arpeggio doesn't get an arrow unless it is explicitly overridden in 
the Staff context, as can be seen in this example:

%========================
\version "2.13.47"
\score {
    \new Staff {
        \set Staff.connectArpeggios = ##t
        \new Voice {
            \relative c'' {
<< { \arpeggioArrowUp <b e g>4\arpeggio }
                \\ { e,\arpeggio } >>
                \revert Staff.Arpeggio #'stencil
                \revert Staff.Arpeggio #'X-extent
                \override Staff.Arpeggio #'arpeggio-direction = #UP
<< { <b' e g>4\arpeggio }
                \\ { e,\arpeggio } >>
            }
        }
    }
    \layout {
        \context {
            \Staff
                \consists "Span_arpeggio_engraver"
        }
    }
}
%========================

Nick

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