gtk_drag_icon_create_widget_for_value() is private. Right or wrong?
gtk_drag_icon_create_widget_for_value() is not declared GDK_AVAILABLE_IN_ALL, which makes it a private function, not available to language bindings and applications. If this is deliberate, the declaration should be moved to a private header file. Otherwise, GDK_AVAILABLE_IN_ALL should be added.