Selects an item in the receiver. If the item was already selected, it remains selected.
@param item the item to be selected
@exception IllegalArgumentException
ERROR_NULL_ARGUMENT - if the item is null
ERROR_INVALID_ARGUMENT - if the item has been disposed
@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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