Menu separators inconsistent

[FLHerne]

In Qt, the separators in menus have 3px padding above and below, making them 7px high overall. The central line reaches both edges of the menu.

In Gtk3, this padding is doubled to 6px, for a total height of 13px. This adds a lot of whitespace in menus with a few separators. There are gaps to each side of the line.

In Gtk2, there is 3px padding above and 6px below. This makes the separators look rather uneven. There are also gaps.

Qt5

Gtk3

Gtk2