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

[Van L]

Hello,

The *Colors* buffer has black text on color backgrounds that is not always 
readable.

Line 1 has black text on black background. The cursor does blink the character 
which is then readable, very, very briefly.

Line 22 has black text on blue background which for me isn’t easy to read. The 
medium blue on the next line is difficult for black text.

I’d like to suggest color contrast arcs through a distorted triangle colorspace 
for choosing textcolor always in contrast to the background color for easy 
reading. In the case of black, blue, medium blue background the text color is 
white. Perhaps, only a dozen special cases are needed to switch black to white 
text color and the colorspace idea is overkill.

Thanks.