Issue #3494342 - Closing dialogs can cause content in editor to horizontally scroll

Closes #3494342

build/js/post-messages-listener.js

@@ -45,7 +45,7 @@
       },
       onCloseMercuryDialog: function () {
         document.querySelectorAll('.is-me-focused').forEach((el) => {
-          el.focus();
+          el.focus({preventScroll: true});
           el.classList.remove('is-me-focused');
         });
       }