Update app.py

app.py

@@ -76,14 +76,22 @@ def get_messages_html(messages):
             </div>
         </div>
         """
-    # Robust Auto-Scroll Script
+    # Robust Auto-Scroll Script using MutationObserver
     html += """
     </div>
     <script>
         (function() {
-            var c = document.getElementById('chat-container');
-            if(c) { 
-                c.scrollTo({ top: c.scrollHeight, behavior: 'smooth' });
+            const container = document.getElementById('chat-container');
+            if (container && !container.dataset.observed) {
+                const scrollDown = () => {
+                    container.scrollTo({ top: container.scrollHeight, behavior: 'smooth' });
+                };
+                const observer = new MutationObserver(scrollDown);
+                observer.observe(container, { childList: true, subtree: true });
+                container.dataset.observed = "true";
+                scrollDown(); // Initial scroll
+            } else if (container) {
+                container.scrollTo({ top: container.scrollHeight, behavior: 'smooth' });
             }
         })();
     </script>