ATK extended roles were deprecated some years ago.
https://bugzilla.gnome.org/show_bug.cgi?id=720123
* onscreen viewport.
* @ATSPI_ROLE_WINDOW: A top level window with no title or border.
* @ATSPI_ROLE_EXTENDED: means that the role for this item is known, but not
- * included in the core enumeration.
+ * included in the core enumeration. Deprecated since 2.24.
* @ATSPI_ROLE_HEADER: An object that serves as a document header.
* @ATSPI_ROLE_FOOTER: An object that serves as a document footer.
* @ATSPI_ROLE_PARAGRAPH: An object which is contains a single paragraph of