Github user mephi42 commented on the issue:
https://github.com/apache/zeppelin/pull/2679
Improved the implementation: before it used form hiding for Chrome, and now
it simply changes that action, which is not used anyway.
Also made sure that even though this change removes the code from the newly
added "enter from username" change, the functionality still works: one can use
enter from both username and password fields in order to submit the form.---
