loom.com: change gif to jpg for c2p covering

Author: siniakinaa

_bt_test.mjs

@@ -38,7 +38,7 @@ export default {
             });
         }
 
-        return {
+        var links = [{
             href: iframe.replaceQuerystring(q),
             type: CONFIG.T.text_html, // Validator fails because we receive x-frame-options. It actually works fine.
             rel: CONFIG.R.player,
@@ -49,8 +49,19 @@ export default {
                     label: "Hide player attribution info"
                 }
             }
+        }];
+
+        var thumbnail = iframe.placeholder && iframe.placeholder.replace(/\.gif(?=[^.]*$)/i, '.jpg');
+        if (thumbnail) {
+            links.push({
+                href: thumbnail,
+                type: CONFIG.T.image,
+                rel: CONFIG.R.thumbnail
+            });
         }
 
+        return links;
+
     },
 
     tests: [