src/vs/workbench/contrib/notebook/browser/viewModel/baseCellViewModel.ts/BaseCellViewModel/addModelDecoration
class BaseCellViewModel:	addModelDecoration(decoration: model.IModelDeltaDecoration): string {
		if (!this._textEditor) {
			const id = ++this._lastDecorationId;
			const decorationId = `_lazy_${this.id};${id}`;
			this._resolvedDecorations.set(decorationId, { options: decoration });
			return decorationId;
		}

		const result = this._textEditor.deltaDecorations([], [decoration]);
		this._resolvedDecorations.set(result[0], { id: result[0], options: decoration });
		return result[0];
	}