This commit series splits the title of the widget from the card list area with a small transparent
separator, and (optionally) allows setting the title background and foreground from the list background and foreground.
By default, I've made the title slightly less opaque than the list. I think it looks good like that. But users can now customize the look more if they like.
The color selectors for the title background and title foreground now have a new button that will copy in the color of the list background and list foreground, so it's easier to set the list background/foreground, copy them to the title, then tweak the title's opacity or saturation a bit.
copied from pr
plus some refactoring