When a Paste has a useful alternative rendering in Files, provide a hint

Summary: Ref T13528. When a file in Paste (like a Jupyter notebook) has a good/useful document engine, provide a link to Files.

Test Plan: {F7409881}

Maniphest Tasks: T13528

Differential Revision: https://secure.phabricator.com/D21196

src/applications/files/document/PhabricatorJupyterDocumentEngine.php

@@ -748,4 +748,8 @@ final class PhabricatorJupyterDocumentEngine
     return $content;
   }
 
+  public function shouldSuggestEngine(PhabricatorDocumentRef $ref) {
+    return true;
+  }
+
 }