src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/deltaCellDecorations
class NotebookEditorWidget:	deltaCellDecorations(oldDecorations: string[], newDecorations: INotebookDeltaDecoration[]): string[] {
		const ret = this.viewModel?.deltaCellDecorations(oldDecorations, newDecorations) || [];
		this._onDidChangeDecorations.fire();
		return ret;
	}