Per @uboness in #10283 (comment):

The focus border on the top search box in Visualize (and Discover) seems to be cut off on the right end side. The search button is currently directly attached to the box which intuitively causes you to expect the focus border to wrap around it as well.

This is not aligned with how Timelion is designed. There there's a small gap between the buttons and the search box, giving enough space for the focus border to completely show.

We need to choose one way (directly attached or slightly detached) and adjust the focus border appropriately.

The focus border around the search boxes on the top of the Visualize/Timelion/Discover/etc... is different than the focus border of the search box of the Tables.