src/vs/workbench/contrib/notebook/browser/viewModel/baseCellViewModel.ts/BaseCellViewModel/deltaCellDecorations
class BaseCellViewModel:	deltaCellDecorations(oldDecorations: string[], newDecorations: INotebookCellDecorationOptions[]): string[] {
		oldDecorations.forEach(id => {
			this._removeCellDecoration(id);
		});

		const ret = newDecorations.map(option => {
			return this._addCellDecoration(option);
		});

		return ret;
	}