Fixes arg conflicting with group whose arg has default value

src/parse/validator.rs

@@ -283,7 +283,8 @@ impl<'help, 'app, 'parser> Validator<'help, 'app, 'parser> {
                     };
                     let conf_with_arg = || g.conflicts.iter().any(|x| !matcher.is_default_value(x));
                     let arg_conf_with_gr = || {
-                        matcher
+                        !matcher.is_default_value(&g.id)
+                            && matcher
                                 .arg_names()
                                 .filter_map(|x| self.p.app.find(x))
                                 .any(|x| x.blacklist.iter().any(|c| *c == g.id))

tests/conflicts.rs

@@ -267,6 +267,24 @@ fn conflicts_with_alongside_default() {
     assert!(m.is_present("flag"));
 }
 
+#[test]
+fn group_in_conflicts_with() {
+    let result = App::new("conflict")
+        .arg(
+            Arg::new("opt")
+                .long("opt")
+                .default_value("default")
+                .group("one"),
+        )
+        .arg(Arg::new("flag").long("flag").conflicts_with("one"))
+        .try_get_matches_from(vec!["myprog", "--flag"]);
+
+    assert!(result.is_ok(), "{:?}", result.unwrap());
+    let m = result.unwrap();
+
+    assert_eq!(m.value_of("opt"), Some("default"));
+    assert!(m.is_present("flag"));
+}
 #[test]
 fn group_conflicts_with_default_arg() {
     let result = App::new("conflict")