How to make "undisappearable" hyphens?

[Eduardo Vieira]

We know that in some words an hyphen should be used and as part of lyrics of a
song it must not disappear.
I'm trying to do that based on a suggestion of an older version of the manual,
but to no avail:

%%% Here's the snippet:

%% I don't want the hyphen "ti" and "frut" to disappear. The others can
disappear.

\version "2.10.2"
     melody = \relative c' {
        \clef treble
        \key c \major
        \time 4/4

        a4 b c d
     }

     text = \lyricmode {
        Tut --
        \override LyricHyphen #'minimum-length = #1.0
        \override LyricHyphen #'springs-and-rods = 
#ly:hyphen-spanner::set-spacing-rods

        ti -- frut -- ti
     }

     \score{
        <<
           \new Voice = "one" {
              \melody
           }
           \new Lyrics \lyricsto "one" \text
        >>

     }

    \paper { ragged-right = ##t }

%%%%%%

Eduardo

Have a good day!
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