One regression that really annoys me: in recent KDE themes, the default "active window" and "background window" titlebar colors are indistinguishable. So you ha

One regression that really annoys me: in recent KDE themes, the default "active window" and "background window" titlebar colors are indistinguishable. So you have no clue where all your input events are going to go. And if you actually set them to reasonable colors, certain applications do weird epileptic things (looking at you, Firefox!)