setting text span to breakable?

[Jaime E Oliver]

Hi again, 

I have a similar problem as I did with the glissandos. 

If I generate a text spanner with a beginning and an end. (such as in the 
example sul pont ------> ord.) and it breaks over two lines of music, I'd like 
to have the sul pont. in the first line and ord in the second with a broken 
line, but instead lilypond places sul pont at the beginning of the expression 
then ord at the end of the line, then again in the next line sul pont. and then 
ord at the end. 

Is there a way to write the texts at the beginning and end of the line and not 
at the breaking points? In other words, to have the text only at the leftmost 
and rightmost bounds?

This is again on latest lilypond 2.18.2-1 on os x 10.8.5 and the code below 
reproduces it.

best,

J

\header {
        title = "writing text spans "
}

inst_part = \relative c' 
{

\time 4/4

\clef treble 
% ________________________________________bar 1 :
 
        \once \override TextSpanner.bound-details.left.text = #"sul tasto " 
        \once \override TextSpanner.bound-details.right.text = #" sul pont " 
        \once \override TextSpanner.bound-details.right.arrow = ##t 
        \once \override TextSpanner.style = #'line 
dis2\startTextSpan
                cis8[ f8]
                        f8[ f8] |
% ________________________________________bar 2 :
cis8[ e8]
        g8[ dis8]
                f8[ f8]
                        dis8[ f8] |
% ________________________________________bar 3 :
dis8[ g8]
        fis8[ cis8]
                dis8[ cis8]
                        g'8[ f8] |
% ________________________________________bar 4 :
c8[ cis8]
        cis8[ f8]
                f8[ d8]
                        cis8[ e8] |
% ________________________________________bar 5 :
g8[ e8]
        g8[ f8]
                d8[ fis8]
                        d8[ cis8] |
% ________________________________________bar 6 :
                f2\stopTextSpan
}

\score {
        \new Staff {
                \new Voice {
                        \inst_part
                }
        }
        \layout {
                \override TextSpanner.bound-padding = #1.0
                \override TextSpanner.bound-details.right.padding = #1.3
                \override TextSpanner.bound-details.right.stencil-align-dir-y = 
#CENTER
                \override TextSpanner.bound-details.left.stencil-align-dir-y = 
#CENTER
                #(set-default-paper-size "a4")
        }
        \midi { }
}

\version "2.18.2"
% notes Pd External version testing