Extending a TrillSpanner

For TrillSpanner, the minimum-length property becomes effective only if the set-spacing-rods procedure is called explicitly.

To do this, the springs-and-rods property should be set to ly:spanner::set-spacing-rods.

\relative c' {
  \key c\minor
  \time 2/4
  c16( as') c,-. des-.
  \once\override TrillSpanner.minimum-length = #15
  \once\override TrillSpanner.springs-and-rods = #ly:spanner::set-spacing-rods
  \afterGrace es4
  \startTrillSpan { d16[( \stopTrillSpan es)] }
  c( c' g es c g' es d

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LilyPond snippets v2.25.18 (development-branch).