Fix drag task (unfinished)

edit-mode/function/ganttEvent.js

@@ -55,6 +55,11 @@ gantt.attachEvent("onBeforeTaskUpdate", function(id,new_item){
     new_item['progress'] = progress;
 });
 
+gantt.attachEvent("onAfterTaskDrag", function(id, mode, e){
+    var task = gantt.getTask(id);
+    task.end_date = gantt.calculateEndDate(task);
+    gantt.updateTask(id);
+});
 
 gantt.attachEvent("onBeforeLinkAdd", function(id,link){
     //any custom logic here