[Frontend] Add animation when new message arrives

chatto/src/main/javascript/ts/src/view/ChatView.ts

@@ -82,6 +82,14 @@ export class ChatView implements Observer<ChatMessageViewModel> {
           // if (cd.data.length > 0) {
           //   this._userModel.notify();
           // }
+          $(this._messageContainer)
+          .stop()
+          .animate(
+            {
+              scrollTop: $(this._messageContainer)[0].scrollHeight,
+            },
+            1500
+          );
         }
         break;
       case "page":