Drop-down menus are positioned incorrectly under native Wayland apps

[rzhikharevich]

Some (custom?) drop-down menus work correctly, but most don't. Running sway. Also reproducible under orbment.

[Hummer12007]

To state more precisely: child views which should be spawned at relative coordinates, are spawned at that global coordinates instead (or close to that, from what it looks like).