Module ops 

Edit operations and the invariants they preserve.

Every timeline edit is an EditOp applied to an EditProject. Operations are validated and invariant-preserving (see EditProject::check_invariants). Undo / redo is layered on top in crate::history.

Trim / split / speed operate on the segment list; the zoom operations operate on the zoom list, which is kept sorted by start frame.

Enums

EditError

Why an EditOp could not be applied.

EditOp

A single, undoable edit applied to an EditProject.

TrimEdge

Which edge of a segment a EditOp::Trim moves.