GtkRequisition child_req;
gint child_xpad, child_ypad;
GdkRectangle child_expose_area;
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gtk_cell_renderer_get_size (child, widget, NULL, NULL, NULL, &(child_req.width), &(child_req.height));
g_object_get (child, "xpad", &child_xpad, "ypad", &child_ypad, NULL);