Change right-end placement of VoiceFollower line

[DJF]

In the example below, I need the VoiceFollower line from the left hand to go to 
the A half-note in the right hand, not to the quarter rest. I’ve tried to see 
if I could move the right end of the line over using an \override, but I can 
only seem to move the entire line (like with 
VoiceFollower.bound-details.right.padding). Other setting combinations don’t 
seem to do anything,  or at least I haven’t yet found a combination that does 
what I need.

I could manually create a diagonal line--and I’ll do that only as a last 
resort--but I was curious if I’m missing something that might remedy this from 
within the VoiceFollower options. Any suggestions?

-- Dan


\version "2.19.80"

\score {
   \new PianoStaff
   <<
     \new Staff = "right"
      { \showStaffSwitch
        a'4 \change Staff = "left" g8 f e d c b,
      }
      
      \new Staff = "left"
      { \clef bass   
        \showStaffSwitch
        a4 \change Staff = "right" r4 a'2
      }
   >>
}

staffswitch-test.ly
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