\version "2.14.2"

\relative c {
        \clef "treble_8"
\once \override Glissando #'(bound-details left Y) = #-3
                \once \override Glissando #'(bound-details right Y) = #-1.5
                % effective only when both overrides are present
                
                %neu dazu: Linienlänge rechts verkürzen, damit sie den Fingersatz nicht schneidet
                \override Glissando #'(bound-details right padding) = #2.5 %Linie rechts
                
                \once \override Glissando #'minimum-length = #5   % <=====
                \once \override Glissando #'springs-and-rods = #ly:spanner::set-spacing-rods 
 \once \override TextScript #'extra-offset = #'(0 . 1) <c d bes' e >2\glissando_\markup \rotate #19 { \bold \italic "gliss."}  
\once \override Glissando #'(bound-details left Y) = #0
                \once \override Glissando #'(bound-details right Y) = #-1
                % effective only when both overrides are present
                \once \override Glissando #'minimum-length = #4.5   % <=====
                \once \override Glissando #'springs-and-rods = #ly:spanner::set-spacing-rods        
        \once \override Script #'padding = #1 <d e a bes'>1\fermata
         }