Pixel line visible between CSD header bar and menu bar

[dccoder84]

CSD header bars have a border at the bottom with 1 pixel in size which has a different color than the menu or header bar.

As a workaround one can set this code into ~/.config/gtk-3.0/gtk.css:

headerbar {border-bottom-width: 0px;}

I tested this with Xubuntu 21.04 which ships with Gtk version 3.24.25.

The picture below shows mousepad version 0.5.5:

[dccoder84]

Maybe it's a Gtk issue because even the Adwaita Dark theme has the same issue but less obvious. Below is a screenshot of a window with the Adwaita Dark theme when the window hasn't focus. What do you think?

[khurshid-alam]

The border is to differentiate headerbar with menubar. Isn'r global menu enabled by default on xfce? Also note that numix port to gtk-3 of xfce widgets hasn't finished yet.

[dccoder84]

When this border is on purpose then why isn't it visible on SSD titlebars? Also from a visual design perspective I think the windows without this border look much better.