Popover classNameFooter prop is not respected when footerWalkthroughActions is specified

[gfyhui]

For a popover, specify both footerWalkthroughActions and classNameFooter. classNameFooter is not added as a class name to the .slds-popover__footer element, as the prop description says it does.

Popover without any special class name on the footer element:

Code, which species the classNameFooter:

[stale]

This issue has been automatically marked as stale, because it has not had recent activity. It will be closed if no further activity occurs. Maintainers are responsible for tech debt and project health. This is most likely a new components or component feature request. Please submit a pull request for or request feedback on this feature. Thank you.