What problem does this address?

The Popover component in @wordpress/components does not currently provide a way to specify an offset when it meets the viewport edge. A popover appears cut off or unclear when positioned near the screen boundary.

This issue was observed in DataViews' settings dropdown. Although the dropdown is scrollable and remains functional, it is not visually clear that content is accessible via scrolling. Users may mistakenly believe that the menu is truncated instead of fully available.

This issue affects any UI that relies on Popover for dropdowns, modals, or floating panels.

What is your proposed solution?

• Expose a new prop in the Popover component, similar to the existing overflowPadding prop from Ariakit's popover component.
• Use this new prop in Popover to add a small offset when calculating max height, ensuring that popovers are never flush with the viewport edge.
• Allow DataViews (and other components relying on Popover) to leverage this enhancement, improving visibility without requiring manual workarounds.