Merge pull request #4331 from open-formulieren/issue/4012-ckeditor-mi…

…ssing-link-popup

🐛 [#4012] Fix content component link popup in form builder

src/openforms/js/components/formio_builder/WebformBuilder.js

@@ -184,6 +184,7 @@ class WebformBuilder extends WebformBuilderFormio {
         // Clean up.
         this.removeEventListener(this.dialog, 'close', dialogClose);
         this.dialog = null;
+        root.unmount();
       };
       this.addEventListener(this.dialog, 'close', dialogClose);