You can check to see if a spell was canceled by the user by checking the progress bar of the casting window to see if it was close to 1.000 or not when it was hidden... but how would you check through the UI to see if something was queued? To be a smart queue, you'd have to keep the spell queued even when the queue gets cleared. Since you cannot see if something is queued, that part sort of fails because queuing the same spell while one is queued will also clear the queue. Or do you mean to not queue it in the normal sense but have an auto cast once the previous spell has completed casting(when the casting bar is hidden)?
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