Increase menu spacing
To my eyes, menus in GNOME look really cramped. This goes against the goal of making adwaita feel more open and spacious, and makes us feel outdated compared to what other platforms are doing.
Meanwhile, in GNOME (admittedly, GTK 3)...
The following looks pretty good to me, and can be achieved with the attached CSS in the Inspector:
Obviously more than spacing is being changed here, and we can stick to spacing only for this issue. The changes will likely need more testing, and we might need to think about whether the same spacing should be used for context menus.