Add short delay after before resizing message.

layouts/scripts/frame-index.js

@@ -8,8 +8,10 @@ function setupResizeListener() {
   const RESIZE_CODE = 'resize:';
 
   const resizeObserver = new ResizeObserver(entries => {
-    const height = document.body.scrollHeight;
+    setTimeout(() => {
-    window.parent.postMessage(RESIZE_CODE + JSON.stringify({height}), '*');
+      const height = document.body.scrollHeight;
+      window.parent.postMessage(RESIZE_CODE + JSON.stringify({height}), '*');
+    }, 200);
   })
 
   resizeObserver.observe(document.body);