src/vs/editor/common/model/editStack.ts/SingleModelEditStackElement/constructor
class SingleModelEditStackElement:	constructor(
		public readonly label: string,
		public readonly code: string,
		model: ITextModel,
		beforeCursorState: Selection[] | null
	) {
		this.model = model;
		this._data = SingleModelEditStackData.create(model, beforeCursorState);
	}