src/vs/workbench/contrib/notebook/browser/diff/diffElementViewModel.ts/SideBySideDiffElementViewModel/isOutputEmpty
class SideBySideDiffElementViewModel:	isOutputEmpty() {
		if (this.mainDocumentTextModel.transientOptions.transientOutputs) {
			return true;
		}

		if (this.checkIfOutputsModified()) {
			return false;
		}

		// outputs are not changed

		return (this.original?.outputs || []).length === 0;
	}