ls: escape non-ASCII control chars in UTF-8 locale quoting

.vscode/cspell.dictionaries/jargon.wordlist.txt

@@ -254,6 +254,5 @@ Hijri
 Nowruz
 charmap
 hijri
-
 ctype
 clocale

src/uu/ls/src/display.rs

@@ -184,6 +184,14 @@ fn locale_quote(name: &OsStr, style: LocaleQuoting) -> OsString {
                     quoted.push_str("\\\\");
                 } else if c.is_ascii() && c.is_control() {
                     push_basic_escape(&mut quoted, c as u8);
+                } else if c.is_control() {
+                    // Non-ASCII control characters (the C1 range, e.g.
+                    // U+0085 NEL) are not printable; octal-escape their
+                    // UTF-8 bytes like GNU does for non-printable chars.
+                    let mut buf = [0u8; 4];
+                    for &byte in c.encode_utf8(&mut buf).as_bytes() {
+                        let _ = write!(quoted, "\\{byte:03o}");
+                    }
                 } else {
                     quoted.push(c);
                 }

tests/by-util/test_ls.rs

@@ -2794,6 +2794,7 @@ mod quoting {
             at.touch("it's");
             at.touch("say \"hi\"");
             at.touch("tab\there");
+            at.touch("nel\u{0085}here");
 
             let out = ucmd
                 .env("LC_ALL", "en_US.UTF-8")
@@ -2820,6 +2821,11 @@ mod quoting {
                 out.contains(&format!("{lq}tab\\there{rq}")),
                 "{style}: tab should be escaped as \\t: {out:?}"
             );
+            // Non-ASCII (C1) control characters are octal-escaped by byte.
+            assert!(
+                out.contains(&format!("{lq}nel\\302\\205here{rq}")),
+                "{style}: U+0085 should be octal-escaped: {out:?}"
+            );
         }
 
         // In the C locale, locale uses ASCII single quotes and clocale uses