just escape @ in output text with autolink! ez!

Author: kivikakk

src/cm.rs

@@ -232,6 +232,7 @@ impl<'a, 'o, 'c> CommonMarkFormatter<'a, 'o, 'c> {
                     || c == '\\'
                     || c == '`'
                     || c == '!'
+                    || (self.options.extension.autolink && c == '@')
                     || (c == '&' && isalpha(nextb))
                     || (c == '!' && nextb == 0x5b)
                     || (self.begin_content

src/tests/commonmark.rs

@@ -132,3 +132,16 @@ Let's include some \*important\* \_ones\_ too.
     options.render.experimental_minimize_commonmark = true;
     commonmark(input, input, Some(&options));
 }
+
+#[test]
+fn dont_create_autolinks() {
+    let input = "[email protected]_";
+
+    let mut options = Options::default();
+    options.extension.autolink = true;
+
+    let expected = "a\\_b\\@c.d\\_\n";
+    commonmark(input, expected, Some(&options));
+
+    commonmark(expected, expected, Some(&options));
+}