Ticket #30998: 30998.patch

wp-includes/js/jquery/ui/draggable.js

@@ -766 +766 @@
                 });
         },
         drag: function( event, ui, draggable ) {
+
+                var that = this;
+
                 $.each( draggable.sortables, function() {
                         var innermostIntersecting = false,
                                 sortable = this;
@@ -799 +802 @@
                                 // so that the move-in stuff gets fired only once.
                                 if ( !sortable.isOver ) {
                                         sortable.isOver = 1;
+                                        //Now we fake the start of dragging for the sortable instance,
+                                        //by cloning the list group item, appending it to the sortable and using it as draggable.currentItem
+                                        //We can then fire the start event of the sortable with our passed browser event, and our own helper (so it doesn't create a new one)
+                                        sortable.currentItem = $(that).clone().removeAttr("id").appendTo(sortable.element).data("ui-sortable-item", true);
 
-                                        sortable.currentItem = ui.helper
-                                                .appendTo( sortable.element )
-                                                .data( "ui-sortable-item", true );
-
                                         // Store helper option to later restore it
                                         sortable.options._helper = sortable.options.helper;
 
@@ -872 +875 @@
                                         sortable.options.revert = sortable.options._revert;
                                         sortable.options.helper = sortable.options._helper;
 
+                                        //Now we remove our currentItem, the list group clone again, and the placeholder, and animate the helper back to it's original size
+                                        sortable.currentItem.remove();
                                         if ( sortable.placeholder ) {
                                                 sortable.placeholder.remove();
                                         }