Created attachment 164707 [details]
AT-SPI2 accessible-event listener

STEPS TO REPRODUCE:
1. Launch the attached AT-SPI2 accessible-event listener in a terminal
2. Use Meta+Alt+P to move focus to the panel
3. Use Right/Left arrow to move among items outside of, and within, the system tray

Note that you may need to set an environment variable. I (Orca maintainer) have quite a few set in my .bashrc, but I *think* the one relevant here is:

     export QT_LINUX_ACCESIBILITY_ALWAYS_ON=1

OBSERVED RESULT:
There are quite a few duplicate focus events for system tray items. See sample output below.

EXPECTED RESULT:
There should be a single focus event when an item gains focus and when it loses focus. See sample output below.

EXAMPLE OUTPUT FROM OUTSIDE THE SYSTEM TRAY (GOOD):
(The Application Launcher had focus. Then I pressed right arrow three times. With each press, the previously-focused item notifies that it lost focus, and the newly-focused item notifies that it gained focus.)

==============================================
Application Launcher push button is now focused: True
Application Launcher push button is now focused: False
System Settings push button is now focused: True
System Settings push button is now focused: False
Discover push button is now focused: True
Discover push button is now focused: False
Home — Dolphin push button is now focused: True
==============================================

EXAMPLE OUTPUT FROM THE SYSTEM TRAY (BAD):
(This is from a single press of right arrow, causing the "dropbox" system tray item to become focused. Only the first -- or if you prefer the last -- event should be present. The rest are duplicates.

==============================================
dropbox push button is now focused: True
dropbox push button is now focused: False
dropbox push button is now focused: True
dropbox push button is now focused: False
dropbox push button is now focused: True
==============================================

Each press of left/right arrow in the system tray gives me those five events; it's not just the first item in the tray.

IMPACT:
I'm handling this in Orca, but no one likes event spam. :) So if you could get to the bottom of these extra events and stop them from occurring, that would be great. Thanks in advance!