src/vs/editor/common/model/editStack.ts/SingleModelEditStackElement/append
class SingleModelEditStackElement:	public append(model: ITextModel, textChanges: TextChange[], afterEOL: EndOfLineSequence, afterVersionId: number, afterCursorState: Selection[] | null): void {
		if (this._data instanceof SingleModelEditStackData) {
			this._data.append(model, textChanges, afterEOL, afterVersionId, afterCursorState);
		}
	}