Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item. If no item is found, returns -1.
@param item the search item
@return the index of the item
@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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