Fix formatted URL from becoming an autolink

Closes GH-10.

Author: wooorm

lib/util/format-link-as-autolink.js

@@ -11,6 +11,10 @@ function formatLinkAsAutolink(node, context) {
     node.url &&
     // And there’s a no title…
     !node.title &&
+    // And the content of `node` is a single text node…
+    node.children &&
+    node.children.length === 1 &&
+    node.children[0].type === 'text' &&
     // And if the url is the same as the content…
     (raw === node.url || 'mailto:' + raw === node.url) &&
     // And that starts w/ a protocol…

test.js

@@ -2720,5 +2720,9 @@ test('roundtrip', function (t) {
 
   t.equal(to(from(doc)), doc, 'should roundtrip adjacent block quotes')
 
+  doc = '[**https://unifiedjs.com/**](https://unifiedjs.com/)\n'
+
+  t.equal(to(from(doc)), doc, 'should roundtrip formatted URLs')
+
   t.end()
 })