private static boolean canHandleDropEvent(@NotNull Project project, @NotNull DnDEvent event) {
    Object attachedObject = event.getAttachedObject();
    if (attachedObject instanceof ChangeListDragBean) {
      List<Change> changes = ((ChangeListDragBean)attachedObject).getChanges();
      return !changes.isEmpty();
    }
    return false;
  }
private static boolean canHandleDropEvent(@NotNull Project project, @NotNull DnDEvent event)