While doing #3890, I reviewed all our instances of [Physical|Logical|]Position, and categorized them relative to their origin point:

Desktop coordinates:

• MonitorHandle::position
• WindowEvent::Moved
• Window::outer_position/Window::set_outer_position

Window coordinates:

• Window::surface_position
• Window::set_cursor_position
• WindowEvent::Pointer*.position (from Implement the pointer event overhaul #3876) (maybe?)
• WindowEvent::Drag*.position (from Rework DnD redux #4079) (maybe?)

Surface coordinates:

• Window::set_ime_cursor_area
• Window::show_window_menu

MouseScrollDelta::PixelDelta is a delta, so it has no origin and hence no coordinate system.

I believe that we should make set_cursor_position, WindowEvent::Pointer*.position and WindowEvent::Drag*.position use surface coordinates, since that's the easier coordinate system for users to work with.