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                Selected by:
              
                :substructure-redirect on parent.
             
              The :configure-request event is generated when a client 
              program sets the x, y, width, heigh
              t, border-width or stacking priority attributes of a 
              window that has the override-redirect attribute :off.
             
              
                parent, event-window
              
                Type window. 
                The window receiving the event. The receiving client must 
                have selected :substructure-redirect on this window.
              
                window
              
                Type window. 
                The window to be reconfigured.
              
                x
              
                Type int16. 
                x and y specify the requested upper-left corner 
                position of the window relative to the parent. If 
                either x or y is not specified in the 
                value-mask, then it is set to the current window position.
              
                y
              
                Type int16. 
                x and y specify the requested upper-left corner 
                position of the window relative to the parent. 
                If either x or y is not specified in the 
                value-mask, then it is set to the current window position.
              
                width, height
              
                Type card16. 
                width and height specify the requested size of 
                the window interior. If either width or 
                height is not specified in the value-mask, then it 
                is set to the current window size.
              
                border-width
              
                Type card16 
                The requested window border width. If border-width
                 is not specified in the value-mask, then it is 
                set to the current window border-width.
              
                stack-mode
              
                Type (member :above :below :top-if :bottom-if 
                :opposite). stack-mode and above-sibling 
                specify the requested stacking priority of the window. 
                If stack-mode is not specified in the value-mask
                , then it is set to :above.
              
                above-sibling
              
                Type (or null window). stack-mode and 
                above-sibling specify the requested stacking priority of 
                the window. If above-sibling is not specified 
                in the value-mask, then it is set to nil.
              
                value-mask
              
                Type mask16. 
                Specifies the changed window attributes contained in 
                the redirected client request. Each 1 bit specifies that the 
                corresponding attribute was changed.
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