Deselects the item at the given zero-relative index in the receiver. If the item at the index was already deselected, it remains deselected. Indices that are out of range are ignored.
@param index the index of the item to deselect
@exception SWTException
ERROR_WIDGET_DISPOSED - if the receiver has been disposed
ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
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