bug#41544: 26.3; Possible incorrect results from color-distance

[Tom Tromey]

Mattias> Try the attached patch. A couple of constants used for
Mattias> comparison were recomputed, but since they mostly appeared to
Mattias> have been picked out of thin air, I didn't bother attempting a
Mattias> very precise translation.

Thank you for doing this.

I wasn't sure whether Emacs would accept a patch changing the return
value in this way.

However, my main concern is just whether it still picks reasonably
contrasting colors when editing CSS.  If it does, then that's good
enough for me.

thanks,
Tom