textSpanner bound-details on two lines

[Eluze]

a few question about text spanner bound-details:

1. is it possible to keep the right-broken text inside the system
2. if there is only one note left, the spanner line stops on the first line,
and the right-(broken-) text is printed - probably a bug
3. can the continuation after the break be aligned with the first note?
4. the end (right) mark seems to be centered on the last note - can i push
it to the right?

tia
-Eluze

http://www.nabble.com/file/p20340841/textSpanner%252Bbreak.png 

\version "2.11.63"
{ 
  \override TextSpanner #'bound-details #'right #'text = #(markup
#:draw-line '(0 . -.5))
  \override TextSpanner #'bound-details #'right-broken  #'text = "cont."
  \override TextSpanner #'bound-details #'left #'text = "left" 
 
  a' 1 \startTextSpan 
  \break
  a' 1 \stopTextSpan
  \bar "||"
  b' 1 \startTextSpan 
  \break
  b' 2 b' 2 \stopTextSpan
  }


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