Shortened line containing second time repeat volta has problems

[John McWilliam]

The situation is as follows. A pipe tune made up of two parts where each part
is repeated once. The first part has an alternative ending when played the
second time. This appears on a shortened line of its own. The second part
also has an alternative ending when play the second time and this matches
the ending of the first part. 
I have two problems with this both of which are, in a way, aesthetic but
irritating:
1. I cannot close the second time volta.
2. I cannot eliminate the barline which appears at the end of the shortened
second time line.
--------------------------------------------------------------------------------------------

\version "2.18.0"


\score {

    \new Staff  {
    \time 3/4       %adjust time to suit specific tunes
    \bar ".|:"
                
    % Part 1
        \set Score.repeatCommands = #'(start-repeat)
        
        \repeat unfold 4 {a4 a a}
 
        \set Score.repeatCommands = #'((volta "1"))
        \repeat unfold 4 {a4 a a}
        \break
 
        \set Score.repeatCommands = #'((volta #f) (volta "2. --1,2") 
end-repeat)  
        \repeat unfold 4 {a4 a a} 
        \bar "||"
 
        \set Score.repeatCommands = #'((volta #f)) 
        \stopStaff 
        % Increasing the unfold counter will expand the staff-free space
        \repeat unfold 6 {
          s4 s4 s4
        }  
%      \once \hide Score.BarLine
       \startStaff  % Resume bar count and show staff lines again 
       \break

    % Part 2
        \set Score.repeatCommands = #'(start-repeat)   
        \repeat unfold 4 {a4 a a } 
 
        \set Score.repeatCommands = #'((volta "1"))  
        \repeat unfold 4 {a4 a a }
        \set Score.repeatCommands = #'((volta #f) end-repeat)
}%end staff
}%end score




-----
John McWilliam
--
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