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xdg_surface window geometry calculation

Hi,

Considering the guidelines outlined here, I am seeking to understand why subsurfaces need to be factored in when determining the window geometry of an xdg_surface. For instance, let's consider a wl_surface with dimensions (100,100):

If the client never sets the window geometry and it has a subsurface positioned at (-10,-10) with dimensions (1,1), shouldn't the geometry simply be (0,0,100,100)? Why is it necessary to account for subsurfaces, and what would be the window geometry in this scenario?

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