Use new QPalette::Accent color for small UI element
Instead of using QPalette::Highlight for both large background areas like in list item and menu items and small areas like outline and small ui elements, use QPalette::Accent for small UI elements and QPalette::Highlight for large UI elements.
Currently both color are the same but in the future this will allow us to use a lighter color for focused item delegates while keeping the strong blue as accent color for smaller elements.