def execute(self, context):
        obj = context.active_object
        root = mmd_model.Model.findRoot(obj)
        mmd_root = root.mmd_root
        frame = mmd_root.display_item_frames[mmd_root.active_display_item_frame]
        if frame.active_item <= len(frame.items)-1:
            return {'FINISHED'}

        frame.items.move(frame.active_item, frame.active_item+1)
        frame.active_item += 1
        return {'FINISHED'}
dataset/ETHPy150Open sugiany/blender_mmd_tools/mmd_tools/operators/display_item.py/MoveDownDisplayItem.execute/swapped operands of `<=`