gdkWindowGetToplevel
Gets the toplevel window that's an ancestor of window.
gdkWindowGetToplevel(object)
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Any window type but GDK_WINDOW_CHILD is considered a
toplevel window, as is a GDK_WINDOW_CHILD window that
has a root window as parent.
[GdkWindow] the toplevel window containing window
Derived by RGtkGen from GTK+ documentation
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