Adwaita: Revert edge to edge menuitems
The "chin" above and below menuitems is the result of not being able to clip the rounded corners of the first and last menuitem.
Every time I look at menus they feel half-baked and unintentional because of that 'chin' and 'forehead'. Reverting to the gtk3 popover design would feel less sleek, but intentional (keeping the new colors and with tighter margins though).
/cc @bertob
Edited by Jakub Steiner