gnome-shell: don't announce nameless window if we have pending focus event
gnome-shell: don't announce nameless window if we have pending focus event

Some users have complained that saying "window" is not especially
helpful when entering the gnome-shell switcher and other views.
We can now peak and queued events, so if the newly-activated gnome-shell
window lacks a name and we have a pending focus event, don't say "window".

See issue #226.

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