Panelled flyout experience

[drewdaemon]

The request

Support a split-flyout (double-wide) pattern.

Background

I am working on a Kibana feature whose design uses a flyout with two distinct panels: one for controls, one for the preview area.

This pattern already exists in at least one place in Kibana, but as a bespoke set of components called FlyoutPanels.

Here it is in use:

Since this is a presentational component and seems like a generally useful pattern, is there interest in transferring ownership of these components to EUI?

[ryankeairns]

Adding another example, Security places the second column to the left:

[ryankeairns]

I've started a discussion around if/how to approach this request. Please feel free to add thoughts, examples, and other comments there: #7056

[cee-chen]

Closing this as resolved/answered by #7056:

While this is an emerging pattern, we aren't quite ready to a) establish an officially-supported pattern or b) provide direct support via EuiFlyout.

If/when the EUI team decides to proceed, the next steps would entail further design exploration, alignment, and resulting guideline creation. At this point, we are not able to prioritize this work and will live with the provided example/answer for the time being.

In the interim, we'll point devs to using the EuiFlexGroup workaround listed in the discussion.