Redefining grace note global defaults

The global defaults for grace notes are stored in the following identifiers.

startGraceMusic
stopGraceMusic
startAcciaccaturaMusic
stopAcciaccaturaMusic
startAppoggiaturaMusic
stopAppoggiaturaMusic

They are defined in file ly/grace-init.ly. By redefining them other effects may be obtained.

\version "2.24"

startAcciaccaturaMusic = {
  <>(
  \override Flag.stroke-style = "grace"
  \slurDashed
}

stopAcciaccaturaMusic = {
  \revert Flag.stroke-style
  \slurSolid
  <>)
}

\relative c'' {
  \acciaccatura d8 c1
}