bozai

- [ ] I have searched the [issues](https://github.com/vueComponent/ant-design-vue/issues) of this repository and believe that this is not a duplicate. ### What problem does this feature solve? 在使用穿梭框的时候，我有个问题，我想控制operations的按钮是否禁用状态，因为有时候我想在选择大于十条之后，就不让左边添加了，因此想禁用 > 按钮的状态 ###...