`strict-grace-spacing` is buggy

[Werner LEMBERG]

Folks,


I've filed issue

  https://gitlab.com/lilypond/lilypond/-/issues/6876

and I wonder whether there is a better workaround than the following.

```
shiftedGrace =
#(define-music-function (offset music) (number? ly:music?)
   #{
     \override NoteHead.X-offset = #(- offset 0.85)
     \override Stem.X-offset = #offset
     \grace { $music }
     \revert NoteHead.X-offset
     \revert Stem.X-offset
   #})

\relative c'' <<
  { g8 \shiftedGrace -0.4 { a32 b c d } es8 }
  { f,32 e d c f8 }
>>

\layout {
  \context {
    \Score
    \override SpacingSpanner.strict-grace-spacing = ##t
  }
}
```


    Werner