fix moving item to new list and keeping old ordering

server/ajax/task.go

@@ -160,16 +160,27 @@ func (a *Ajax) setPrio(w http.ResponseWriter, r *http.Request) error {
 func (a *Ajax) moveTask(w http.ResponseWriter, r *http.Request) error {
 	_, taskID, _ := a.Cur(r)
 	toList := form.Get(r, "to")
+
+	list, err := a.storageGetList(toList)
+	if err != nil {
+		return err
+	}
 	movedTask, err := a.storageGetTask(taskID)
 	if err != nil {
 		return err
 	}
+
 	if err := a.storageDelTask(taskID); err != nil {
 		return err
 	}
+	movedTask.Index = list.NextIndex()
 	if err := a.storageSetTask(toList, movedTask); err != nil {
 		return err
 	}
+	if err := a.storageSetList(list); err != nil {
+		return err
+	}
+
 	return json.NewEncoder(w).Encode(map[string]interface{}{"total": 1, "list": []*task.Task{movedTask}})
 }