[orca-list] More work on missing object:state-changed:focused events in Gtk+3

[Joanmarie Diggs <jdiggs igalia com>]

Hey all.

If I didn't know better, I would say a black hole is sucking up all the
object:state-changed:focused events from Gtk+3. I'm not sure what
changed, but until we can get to the bottom of it and fix it properly,
I've decided to apply what I did for Gecko to Gtk+3. If Orca starts
presenting something it shouldn't or stops presenting something it used
to, please let me know.

Thanks!
--joanie