gruvbox: swiper low contrast of selection

[memeplex]

What did you expect to happen?

Selected item is highlighted but yet clearly legible.

What actually happened?

Selected item is barely legible black on dark grey.

Describe your attempts to resolve the issue

No response

Steps to reproduce

1. Set theme t gruvbox
2. Execute swiper-isearch

Package commit

e716ddb

System Information

macOS Big Sur, emacs-28 branch built from sources with defaults + svg support.