How is that border color defined? (system color schemes)

[chiasa.men]

On Mittwoch, 14. Oktober 2020 08:13:43 CEST Noah Davis wrote:
> KColorUtils::mix( palette.color( QPalette::Window ), palette.color(
> QPalette::WindowText ), 0.25 )
>
> On Tue, Oct 13, 2020 at 2:25 PM chiasa.men <chiasa.men at web.de> wrote:
> > https://pasteboard.co/JvupDV3.png
> >
> > Per trial and error I assumed the line (border of list view (vertical
> > right
> > under the cursor)) color: #bcbebf is defined by a combination of Window
> > Text and Window Background (at least it changes if one of the colors is
> > changed) - but how is it determined exactly?

Thanks! I checked Oxygen Cold Color Scheme - there it seems to be only Window
Background. So, is the use of mix() a breeze only thing?