Display method for \slashedGrace
Input:
\version "2.24.0"
\displayLilyMusic \slashedGrace c''8
Actual (abridged) output of 2.24.1:
\grace { { \override Flag.stroke-style = "grace"
} c''8 { \revert Flag.stroke-style
} }
Expected output:
\slashedGrace c''8