pub fn hold_extend(clip: &mut Clip, hold_s: f64)Expand description
Append one key per track duplicating its final value hold_s
seconds after its last key (a linear hold — charge/block poses).
The clip duration extends to the longest held end.
§Panics
Panics if a hand-built track violates the loader invariant that each key has a corresponding stored value (or cubic-spline triplet).