Filter out bogus window focus claims from gnome-shell
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.
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