[rafram]

This is an incredibly tiny bug in a component that dates back to NeXT [1], but you should use Feedback Assistant and report to Apple.

[1]: http://euclid.psych.yorku.ca/SCS/Gallery/colorpick.html

[wpm]

Where does the link you posted say anything about a bug?

I’ll grant I might just be mole-eyesing it, it’s been a long day.

[rafram]

It doesn't - just a source for the component having existed in its current form since the NeXT days.