ui: ignore hardware keycode 255 on win32

It is a reserved value and doesn't have a corresponding
valid scancode.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Message-id: 20180117164717.15855-5-berrange@redhat.com
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

ui/gtk.c

@@ -1206,6 +1206,12 @@ static gboolean gd_key_event(GtkWidget *widget, GdkEventKey *key, void *opaque)
         return TRUE;
     }
 
+#ifdef WIN32
+    /* on windows, we ought to ignore the reserved key event? */
+    if (key->hardware_keycode == 0xff)
+        return false;
+#endif
+
     if (key->keyval == GDK_KEY_Pause
 #ifdef G_OS_WIN32
         /* for some reason GDK does not fill keyval for VK_PAUSE