Learning_GTK4_tree/testsuite/gtk/ui/dialog8.ui

<!-- missing attribute in dialog markup -->
<interface>
  <object class="GtkDialog">
    <child type="action">
      <object class="GtkButton" id="button_ok">
        <property name="cantdefault">1</property>
      </object>
    </child>
  </object>
</interface>