src/vs/workbench/contrib/notebook/browser/viewModel/notebookViewModel.ts/NotebookViewModel/_getDecorationRange
class NotebookViewModel:	private _getDecorationRange(decorationId: string): ICellRange | null {
		const node = this._decorations[decorationId];
		if (!node) {
			return null;
		}
		const versionId = this.getVersionId();
		if (node.cachedVersionId !== versionId) {
			this._decorationsTree.resolveNode(node, versionId);
		}
		if (node.range === null) {
			return { start: node.cachedAbsoluteStart - 1, end: node.cachedAbsoluteEnd - 1 };
		}

		return { start: node.range.startLineNumber - 1, end: node.range.endLineNumber - 1 };
	}