We use "label" just like GtkLabel as the two widgets differ in the way
they are measured, but they should be styled the same.
If it turns out we change our opinion on this for specific cases, we
can add style classes later.
g_object_class_install_properties (gobject_class, N_PROPS, properties);
+ gtk_widget_class_set_css_name (widget_class, "label");
gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_LABEL);
}