gdkWindowGetToplevels
Obtains a list of all toplevel windows known to GDK on the default
screen (see gdkScreenGetToplevelWindows).
A toplevel window is a child of the root window (see
gdkGetDefaultRootWindow).
WARNING: gdk_window_get_toplevels has been deprecated since version 2.16 and should not be used in newly-written code. Use gdkScreenGetToplevelWindows instead.
gdkWindowGetToplevels()
but its elements need not be freed.
[list] list of toplevel windows,
Derived by RGtkGen from GTK+ documentation
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