>     relative c' {
>          \clef bass
>          \hideNotes \grace b16 \glissando \unHideNotes f8 r8 r4
>          \hideNotes \grace b16 \unHideNotes \glissando f8 r8 r4
>     }

Your first glissando works out, it is just quite short. The second does not 
work, as the glissando needs to be specified after the note. `\unHideNotes` is 
not a post-event, so after then the glissando cannot be attached anymore. 
Anyway, this approach is going the the most easy direction. You just need to 
also control the length of the glissando:

{
  \clef bass
  \grace {
    \once\hideNotes
    c8
    -\tweak minimum-length #2.5
    -\tweak springs-and-rods #ly:spanner::set-spacing-rods
    -\glissando
  }
  f
}

Cheers,
Tina

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