Re: VOTE: Changing completions-common-part face's default

[João Távora]

> However, the 4.5:1 threshold is tuned for readability of text on
>  background, not distinguishability of two text colors. For
> distinguishability, maybe 3:1 or even lower would be enough.

Maybe.  Indeed I don't have the science to tell me otherwise.

So let's choose 3:1 as a threshold for that use.  Certainly
blue3 (1.87) and  blue4 (1.27) don't clear that bar, so let's
ditch those.

João