In Madrid Patch 2 on the Chrome Version 73.0.3683.103 (Official Build) the User ID gets auto populated with previously created user. And it looks like read-only field.
Safari does not auto populate, but provides a dropdown of possible user ids.
Firefox presents a blank form, as expected (no auto population).
Below is the screenshot of the field in chrome browser.
Steps to Reproduce
In Madrid Patch 2 on the Chrome Version 73.0.3683.103
1) Navigate to sys_user.list
2) Create a New User, say admin_test
3) Again click on New button to create a New user
Expected behavior: The user Id field should be blank without any auto populated value.
Actual behavior: The user id field contains auto populated value
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Related Problem: PRB1338892