GList* gdk_screen_get_window_stack ( GdkScreen* screen )
GdkWindows representing the current
On X11, this is done by inspecting the _NET_CLIENT_LIST_STACKING
property on the root window, as described in the
Extended Window Manager Hints.
If the window manager does not support the
_NET_CLIENT_LIST_STACKING hint, this function returns
On other platforms, this function may return
NULL, depending on whether
it is implementable on that platform.
The returned list is newly allocated and owns references to the
windows it contains, so it should be freed using
its windows unrefed using
g_object_unref() when no longer needed.