disable control characters in link definitions

src/parser/inlines.rs

@@ -1152,7 +1152,7 @@ pub fn manual_scan_link_url_2(input: &[u8]) -> Option<(&[u8], usize)> {
             }
             nb_p -= 1;
             i += 1;
-        } else if isspace(input[i]) {
+        } else if isspace(input[i]) || input[i].is_ascii_control() {
             if i == 0 {
                 return None;
             }

src/tests.rs

@@ -553,6 +553,14 @@ fn reference_links() {
     );
 }
 
+#[test]
+fn no_control_characters_in_reference_links() {
+    html(
+        "[A]:\u{1b}\n\nX [A] Y\n",
+        "<p>[A]:\u{1b}</p>\n<p>X [A] Y</p>\n",
+    )
+}
+
 #[test]
 fn link_entity_regression() {
     html(