Migrating from one GTK+ 3 release to another
GTK+ 3 has seen considerable development over multiple stable releases.
While we try to maintain compatibility as far as possible, some minor
adjustments may be necessary when moving an application from one release
of GTK+ 3 to the next.
The following sections list noteworthy changes in GTK+ 3.x release that
may or may not require applications to be updated.
The accessible implementations for GTK+ widgets have been integrated
into libgtk itself, and the gail module does not exist anymore. This
change should not affect applications very much.