bug#33093: 26.1, 7.2 emacs-mac; M-x list-colors-display RET; L1 is black on black

[Van L]

> When a sample text is not legible this warns the user against using such
> combination of foreground and background colors in user's configuration,
> i.e. it's easier for users to visually skip such hardly legible text
> in the list when choosing a suitable color.

It might be not worth the effort because it is near impossible to do, but to 
imagine whiteclouds/bluesky, you could have the text always legible where 
fore/background colors are too near for contrast and a swatch-like solid cursor 
rectangle occupying the first position of the line represents the actual 
foreground color. There you see the fore/background colors are in fact 
indistinguishable. Just a wild idea.