Github user liguohuicmss commented on the issue: https://github.com/apache/zeppelin/pull/2685 Thanks. The test is as following. First. When dragging item in chart settings. The item `still` cannot duplicated in the same groups: ![untitled project](https://user-images.githubusercontent.com/5969176/33199214-4c420cf8-d12a-11e7-87ce-f9d5be9040c8.gif) Second. I test this method in nodejs environment: ![201711240311281511507488261_small](https://user-images.githubusercontent.com/5969176/33199291-a14632c4-d12a-11e7-92aa-66538c362da7.gif)
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