Comment 193 for bug 625793

There is a feature in feature in g-s-d which remembers the keyboard layout for each application. If you switch the active window it will restore the last active layout. It does so by comparing the current active keyboard and the stored keyboard for that window. If they are different it *starts* to change the keyboard. If the user change the keyboard layout while g-s-t hasn't finished changing it will get confused.
I think it's only triggered now because it takes longer to send updates to Application indicator and there is a more chance that user can do something in between.