In a tablature, fingerings with slur no longer working

[Éric]

This was ok in 2.18.2 but no longer in 2.19.48 as can show LilyBin both
versions at :

http://lilybin.com/7maklk/2


The code is :

music = {
  <c'-1> <c'-1>( <d'-3>) }
 
\score {
 <<
   \new TabStaff \music
 >>
 \layout {
   \set TabVoice.fingeringOrientations = #'(left)
   \context {
    \TabStaff
    tablatureFormat = #fret-letter-tablature-format
    fretLabels = #'("a" "b" "c" "d" "e" "f" "g" "h")
  }
   \context {
     \TabVoice
     \consists "New_fingering_engraver"
         \override Fingering.extra-offset = #'(0.4 . -0.1)
   }
 }
}


Please, note that : 
- without setting the fingeringOrientations, both versions are ok (but not
what I wish)
- it is the same problem with default tablature format by numbers
- the extra-offset is purely cosmetic 
This last two are here for easier reading and corresponding to my nead.

Éric



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