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obscure
A window is obscured if some other window obscures it. For example, window A obscures window B if:

Notice that window borders are included in the calculation, and that a window can be obscured and yet still have visible regions. See occlude (there is a fine distinction between obscure and occlude).

occlude
A window is occluded if some other window occludes it. For example, window A occludes window B if:

Notice that window borders are included in the calculation. See obscure (there is a fine distinction between occlude and obscure).

override-shell
A subclass of shell used to override the window manager. This subclass contains pop-up menus and other temporary objects that the user can never resize and so on.

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