void gdk_window_get_frame_extents ( GdkWindow* window, GdkRectangle* rect )
Obtains the bounding box of the window, including window manager titlebar/borders if any. The frame position is given in root window coordinates. To get the position of the window itself (rather than the frame) in root window coordinates, use gdk_window_get_origin().
Rectangle to fill with bounding box of the window frame.
The argument will be set by the function. The data is owned by the instance.