without including gtkitemfactory.h - even though this behaviour has never
been supported in the first place.
+* The GtkFileSystem semi-private interface has been removed.
+ The GTK+ filechooser implementation now uses GIO directly, which has
+ rendered external filesystem implementations unnecessary. Consequently,
+ the GtkFileSystem interface is no longer available, nor the filechooser
+ will load any GtkFileSystem implementation.
+
Release notes for 2.12
======================