[CCode (instance_pos = -1)]
public void selected_request(Gtk.TreeView source){
Gtk.TreeSelection sel = source.get_selection();
Gtk.TreeIter selected;
Gtk.TreeModel model;
sel.get_selected(out model, out selected);
model = source.get_model();
GLib.Value val;
model.get(selected, 1, out val);
this.id_currently_displayed = val.get_int();
this.render();
}
Problem solved. I mistook model.get() for model.get_value()
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