test(complete): Add another sort/filter case

clap_complete/tests/testsuite/engine.rs

@@ -1119,6 +1119,15 @@ pos-c
 --long-flag
 --help	Print help
 -s
+"#]]
+    );
+    assert_data_eq!(
+        complete!(cmd, "--[TAB]"),
+        snapbox::str![[r#"
+--required-flag
+--optional-flag
+--long-flag
+--help	Print help
 "#]]
     );
 }