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The GtkFlowBoxCreateWidgetFunc type lacked GObject Introspection annotations for its arguments. This made gtk_flow_box_bind_model() unusable from Python as the callback function would be passed useless values. The annotations that I've added match those of the similar callback type GtkListBoxCreateWidgetFunc. https://bugzilla.gnome.org/show_bug.cgi?id=780758
d6547060
