Ticket #22696: sortable-index-start.diff

wp-includes/js/media-views.js

@@ -3180 +3180 @@
                 },
 
                 initSortable: function() {
-                        var collection = this.collection,
-                                from;
+                        var collection = this.collection;
 
                         if ( ! this.options.sortable || ! $.fn.sortable )
                                 return;
@@ -3200 +3199 @@
 
                                 // Record the initial `index` of the dragged model.
                                 start: function( event, ui ) {
-                                        from = ui.item.index();
+                                        ui.item.data('sortableIndexStart', ui.item.index());
                                 },
 
                                 // Update the model's index in the collection.
                                 // Do so silently, as the view is already accurate.
                                 update: function( event, ui ) {
-                                        var model = collection.at( from ),
+                                        var model = collection.at( ui.item.data('sortableIndexStart') ),
                                                 comparator = collection.comparator;
 
                                         // Temporarily disable the comparator to prevent `add`