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window gravity
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When windows are resized, subwindows can be repositioned automatically
relative to some position in the window. This attraction of a
subwindow to some part of its parent is known as window
gravity.
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window manager
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Manipulation of windows on the screen, and much of the user interface
(policy) is typically provided by a window manager client.
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window manager shell
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A subclass of shell called wm-shell that interacts with
the window manager.