[REQ] Fade out highlight lines around the window if no border is present

[n4n0GH]

Describe the feature you'd like to see
When using the highlight line that goes around the entire window, there's an unclean break directly after the titlebar when there's no side borders present. A better solution would be to check if side borders exist and if not, fade the line out before it hits the end of the titlebar area. That way all windows would look much cleaner decorated than they are right now.

[n4n0GH]

As comparison, look at the window in the background which has no side borders and the window in the foreground which has extended borders all around.