* ivy.el (ivy-current-match): Update background and add white
foreground for light themes. Update background and add black
foreground for dark themes.
(ivy--add-face): If a face has an explicit foreground, add it ahead,
with no blending. Blend the background as usual.
* swiper.el (swiper-minibuffer-match-face-1):
(swiper-minibuffer-match-face-2): Update the background for light
themes.
(swiper-minibuffer-match-face-4): Update the background for dark themes.