elementary
GtkFrame with border of NONE appear nevertheless
I know it's a weird design but some software i.e. LibreOffice use this pattern and it looks ok on Adwaita but not in elementary
On elementary:
On Adwaita:
On a technical side, it seems that the border node of the frame has a flat style class in this case
Strange, this is in the theme:
https://github.com/elementary/stylesheet/blob/a1d4e8c1f7eaa0879b5ca8e44356e0bbe327d3a2/elementary/gtk-3.0/gtk-widgets.css#L948-L952
It looks like the border has a flat class, but not the frame, so the no border rule isn't getting applied.
If you apply the rule to frame as well (throwing out the usual rule for bordering), it fixes it here and in quite a lot of other apps, though it has side effects in some other parts of elementary like the keyboard shortcuts panel in settings.
