XFWM themes support different thicknesses for the window with focus vs those without. In my custom theme, the focus window get a thick accent-colored border all

XFWM themes support different thicknesses for the window with focus vs those without. In my custom theme, the focus window get a thick accent-colored border all around, and non-focus get a 3 pixel black/white/black border that guarantees a visible separation without drawing much attention.