Arguments: window position
Returns position after modifying it to be the position of the top left corner of the visible-box of window. This is the destructive version of visible-box-top-left. The visible box is the box that indicates what portion of the window's page is currently visible within the window, considering its scroll-position and size. The visible box changes when a window is scrolled or resized.
Common Graphics and IDE documentation is described in About Common Graphics and IDE documentation in cgide.htm.
The documentation is described in introduction.htm and the index is in index.htm.
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