Emitted when a new undoable action is recorded; consumed by the UI to surface an undo affordance (e.g. the deck notification tracker's undo toast).
Optional
Message describing the undoable action.
Scope of the recorded entry, if any.
False when the mapping asked for no undo toast.
Emitted when a new undoable action is recorded; consumed by the UI to surface an undo affordance (e.g. the deck notification tracker's undo toast).