Sam Spilsbury e94af71430 keyboard: Handle case where keyboardMonitor is unset
This may be the case where keyboardIndex is -1, which may be the
case where either the keyboard monitor hasn't been set yet, or
the keyboard is being unmanaged and meta_window_get_monitor
returns -1

https://bugzilla.gnome.org/show_bug.cgi?id=788882


(cherry picked from commit 19e864ed3b85278ed1a9527ce3c29646328c19ec)
2018-08-31 14:39:12 +00:00
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