Created attachment 315844 [details]
pyatspi accessible-event listener

Steps to reproduce:
1. Launch the attached accessible-event listener in a terminal
2. Quit the Entry Completion demo if it's open
3. Launch gtk3-demo's Entry Completion demo
4. Type "t" to cause the completion pop up to appear
5. Down arrow twice

Expected results: object:state-changed:selected (true) events emitted as the selection changes

Actual results: no object:state-changed:selected (true) events emitted as the selection changes -- initially.

Note: If, after completing step 5, you up arrow, the events are emitted. If you then re-down arrow, they are emitted. And they'll continue to be emitted as expected even after the entry completion is collapsed (hence step 2 above).

Impact: Because the events are initially missing, Orca doesn't present the selection changes.