Fix media edits sometime not being centered

js/edit_plus/plugins/field-plugin-base.js

@@ -338,13 +338,16 @@ export class FieldPluginBase {
     sizedPlaceholder.classList.add('sized-placeholder');
     pageElement.parentElement.insertBefore(sizedPlaceholder, pageElement);
 
-    this.positionFormItemOverPageElement();
-    document.addEventListener('scroll', this.positionFormItemOverPageElement);
-    window.addEventListener('resize', this.positionFormItemOverPageElement);
+    pageElement.classList.add('edit-plus-hidden');
+    formItem.classList.add('edit-plus-editing');
 
     // Make the sized placeholder the same height as the form item.
     sizedPlaceholder.style.height = formItem.getBoundingClientRect().height + 'px';
 
+    this.positionFormItemOverPageElement();
+    document.addEventListener('scroll', this.positionFormItemOverPageElement);
+    window.addEventListener('resize', this.positionFormItemOverPageElement);
+
     // Ensure the sizedPlaceholder height stays in sync with the formItem height.
     // As items are added or removed from the form item via ajax, the sizedPlaceholder
     // should grow or shrink accordingly.
@@ -358,8 +361,6 @@ export class FieldPluginBase {
     });
     Drupal.EditPlus.CurrentlyEditingElement.sizedPlaceholderHeightObserver.observe(formItem);
 
-    pageElement.classList.add('edit-plus-hidden');
-    formItem.classList.add('edit-plus-editing');
     formItem.classList.remove('edit-plus-hidden');
   }