src/vs/workbench/contrib/notebook/browser/notebook.contribution.ts/NotebookDiffEditorSerializer/serialize
class NotebookDiffEditorSerializer:	serialize(input: EditorInput): string {
		assertType(input instanceof NotebookDiffEditorInput);
		return JSON.stringify({
			resource: input.resource,
			originalResource: input.original.resource,
			name: input.getName(),
			originalName: input.original.getName(),
			textDiffName: input.getName(),
			viewType: input.viewType,
		});
	}