Steps to reproduce the issue

Go to Article/New/Publishing
Tab through the fields.

Expected result

Select user (icon beside the field) should be focusable.

Actual result

Field is focusable (Not needed as nothing can be done there if only selection is to be done that is also from another container) not Select user icon beside it.

System information (as much as possible)

Joomla! 4.0.0-alpha8-dev
Google Chrome Version 72.0.3626.121 (Official Build) (64-bit)
Ubuntu 18.04.2 LTS

Additional comments