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;
		}

		let id: string;
		this._textEditor.changeDecorations((accessor) => {
			id = accessor.addDecoration(decoration.range, decoration.options);
			this._resolvedDecorations.set(id, { id, options: decoration });
		});
		return id!;
	}