src/vs/workbench/contrib/notebook/browser/diff/diffComponents.ts/ModifiedElement/_decorate
class ModifiedElement:	_decorate() {
		if (this.cell.checkIfOutputsModified()) {
			this.notebookEditor.deltaCellOutputContainerClassNames(DiffSide.Original, this.cell.original.id, ['nb-cellDeleted'], []);
			this.notebookEditor.deltaCellOutputContainerClassNames(DiffSide.Modified, this.cell.modified.id, ['nb-cellAdded'], []);
		}
	}