Clear flat review context when page tab lists emit selection-changed
Clear flat review context when page tab lists emit selection-changed

If a wizard-like notebook page being reviewed changes, we might not get
any events to update the locusOfFocus. As a result, subsequent flat
review commands will continue to present the stale content.

GNOME/orca,GNOME/orca,GNOME/orca,GNOME/orca