src/vs/workbench/contrib/notebook/browser/notebookEditor.ts/NotebookEditorSelection/compare
class NotebookEditorSelection:	compare(other: IEditorPaneSelection): EditorPaneSelectionCompareResult {
		if (!(other instanceof NotebookEditorSelection)) {
			return EditorPaneSelectionCompareResult.DIFFERENT;
		}

		if (isEqual(this.cellUri, other.cellUri)) {
			return EditorPaneSelectionCompareResult.IDENTICAL;
		}

		return EditorPaneSelectionCompareResult.DIFFERENT;
	}