Popup menus have been a thing since long time ago. Nvim floating windows are true arbitrary windows (they are placed in floating layers over other windows and t

Popup menus have been a thing since long time ago. Nvim floating windows are true arbitrary windows (they are placed in floating layers over other windows and then composited within the grid; in more flexible UIs they can be handled independently); I assume vim 8.2 floating windows are more or less the same.