[Discover] Paging through records with mouse or keyboard should update flyout contents

[shaunmcgough]

When the new data grid is enabled, if you click on a row or arrow through the rows of records, it should update the display of the flyout to reflect the record you've clicked on (regardless of the field you clicked), and also highlight that row in yellow (as it does when you click the expand arrows.

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[timroes]

I have some a11y concerns around this. In my opinion a behavior like this will break hardly on WCAG 3.2.1 since we're changing context in a non focused part of the UI, by pure focus changes in another part of the UI. cc @myasonik I would like to get your opinion on this suggestion before we consider this.

[myasonik]

It would take some careful work but there are certainly ways we could do this.

WCAG 3.2.1 is pretty easy to avoid running into issues on by not moving focus to the flyout whenever the row changes.

But to do that, we need to have an aria-live region that will announce to screen readers that another part of the page has changed.

To visually better support this split panel design, you might also want to consider the upcoming push flyout style to actually have the table and flyout side-by-side rather than a flyout over the table that you're also supposed to be interacting with.

[kertal]

Requirement for this, using the push flyout https://github.com/elastic/kibana/issues/148902

[kertal]

Closing this because it's not planned to be resolved in the foreseeable future. It will be tracked in our Icebox and will be re-opened if our priorities change. Feel free to re-open if you think it should be melted sooner.