Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1647
Although it changes user experience, it is more consistent behavior
considering other type of dynamic form behavior (input, checkbox).
Regarding the test, while other types of dynamic forms also don't have
automated test. I have created
https://issues.apache.org/jira/browse/ZEPPELIN-1720 and we can resolve it
separately.
LGTM and merge to master if there're no more discussions.
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