MC-18601: Page Builder Render

Author: davemacaulay

app/code/Magento/PageBuilder/view/adminhtml/web/js/master-format/render.js

@@ -90,14 +90,19 @@ export default class MasterFormatRenderer {
      * Create a channel to communicate with our sandboxed iframe
      */
     public setupChannel() {
+        debugLog("Setting up channel");
         this.channel = new MessageChannel();
         const frame = this.getRenderFrame();
         frame.onload = () => {
+            debugLog("onLoad called");
             window.addEventListener("message", (event) => {
+                debugLog("onLoad message called");
+                debugLog(event);
                 if (event.data === "PB_RENDER_READY") {
                     frame.contentWindow.postMessage("PB_RENDER_PORT", "*", [this.channel.port2]);
                     this.ready = true;
                     this.readyDeferred.resolve();
+                    debugLog("channel is ready");
                 }
             });
         };