src/vs/workbench/contrib/notebook/common/model/notebookTextModel.ts/NotebookTextModel/reset
class NotebookTextModel:	reset(cells: ICellDto2[], metadata: NotebookDocumentMetadata, transientOptions: TransientOptions): void {
		this.transientOptions = transientOptions;
		this._cellhandlePool = 0;
		this.applyEdits(
			[
				{ editType: CellEditType.Replace, index: 0, count: this.cells.length, cells },
				{ editType: CellEditType.DocumentMetadata, metadata }
			],
			true,
			undefined, () => undefined,
			undefined,
			true
		);
	}