For most purposes this function is deprecated in favor of
gObjectSetData. However, for historical reasons GTK+ stores
GtkWidget that owns a
GdkWindow as user data on the
GdkWindow. So, custom widget implementations should use
this function for that. If GTK+ receives an event for a
and the user data for the window is non-
NULL, GTK+ will assume the
user data is a
GtkWidget, and forward the event to that widget.
Derived by RGtkGen from GTK+ documentation
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