src/vs/workbench/contrib/notebook/browser/viewModel/notebookViewModel.ts/NotebookViewModel/deltaCellDecorations
class NotebookViewModel:	deltaCellDecorations(oldDecorations: string[], newDecorations: INotebookDeltaDecoration[]): string[] {
		oldDecorations.forEach(id => {
			const handle = this._decorationIdToCellMap.get(id);

			if (handle !== undefined) {
				const cell = this.getCellByHandle(handle);
				cell?.deltaCellDecorations([id], []);
			}
		});

		const result: string[] = [];

		newDecorations.forEach(decoration => {
			const cell = this.getCellByHandle(decoration.handle);
			const ret = cell?.deltaCellDecorations([], [decoration.options]) || [];
			ret.forEach(id => {
				this._decorationIdToCellMap.set(id, decoration.handle);
			});

			result.push(...ret);
		});

		return result;
	}