Mark active categories with class “active”

Hi,

can you add an ekstra class to categories if the post that is displayed is in this category? This is the behavior of regular widget for categories. With this upgrade we would be able to color categories the posts belongs to. You can see how we use the regular widget categories on this post.

It would be very handy if you add an extra “active” class (this is the class the regular widget uses). Would it be possible?

thanks and bye