Notes:
* This will not be presented if the verbosity is set to brief.
* At the present time, no filtering of obvious or default types is
  taking place. (Example: The default popup of an ARIA combo box is
  "listbox". Rather than filtering it out, Orca will present it.
* The information is being tacked on to the very end of presentation
  so it can be interrupted by users who don't find it meaningful.
* What gets spoken when is subject to change based on user feedback.

Note: This can be bypassed by adding the following lines to your
orca-customizations.py:

import orca.settings
orca.settings.presentLiveRegionFromInactiveTab = True

Alt+Tabbing into application windows is sometimes causing gnome-shell
to emit object:state-changed:focused events for an accessible with
the role of window. This is at least sometimes taking place after the
application window gains focus. Since no gnome-shell window seems to
be actually gaining focus, and since windows are expected to emit
window:activate events, these events appear safe to ignore. In addition,
failure to ignore them can cause Orca to load the gnome-shell script
incorrectly.

(cherry picked from commit ee69454f)

This reverts commit 5233b356.

It introduced unwanted chattiness.

When we get the selection-change on a parent of embedded children,
and the selection change spans multiple objects, we want to present
all the changes; not just update the cached selection.

If focus is on a folder and lots of mail comes in, we get two accessible
name change events (one for the row, one for the cell) for each and every
new message which came in. One. At. A. Time. These events are technically
not wrong, but they are really unfortunate.