get-client-size

This gets the size of the window ``client area'' in pixels. The client area is the area which may be drawn on by the programmer, excluding title bar, border, etc.

• (send a-wx:window get-client-size width height) -> void
      width : boxed small integer
      height : boxed small integer

  The width box is filled with the client width and the height box is filled with the client height.