move data, not elements approach

src/Umbraco.Web.UI.Client/examples/sorter-with-two-containers/sorter-dashboard.ts

@@ -17,6 +17,7 @@ const SORTER_CONFIG: UmbSorterConfig<ModelEntryType> = {
 	identifier: 'string-that-identifies-all-example-sorters',
 	itemSelector: '.sorter-item',
 	containerSelector: '.sorter-container',
+	placeholderClass: 'sorter-placeholder',
 };
 
 @customElement('example-sorter-dashboard')
@@ -101,6 +102,9 @@ export class ExampleSorterDashboard extends UmbElementMixin(LitElement) {
 				border-radius: var(--uui-border-radius);
 				margin-bottom: 3px;
 			}
+			.sorter-placeholder {
+				opacity: 0.2;
+			}
 		`,
 	];
 }