What's new in at-spi2-core 2.54.2:

* Use the appropriate notifications for callbacks.

* atspi-device-legacy: Don't crash when XkbGetMap fails

* DeviceEventController: update mouse coordinates before sending button events

    atk-bridge: Don't crash when requesting a plug if not activated

* Fix a couple of memory leaks.

* Fix key notifications under X11 when multiple keyboard layouts are in use.