improve error handling with try-finally block in scroll handler

Signed-off-by: yugalkaushik <[email protected]>

Author: yugalkaushik

js/main.js

@@ -20,8 +20,11 @@
     if (!didScroll) {
       didScroll = true;
       requestAnimationFrame(function () {
-        changeHeader();
-        didScroll = false;
+        try {
+          changeHeader();
+        } finally {
+          didScroll = false;
+        }
       });
     }
   });