columnIndex to newIndex. The old column at columnIndex will now be found at newIndex. The column that used to be at newIndex is shifted left or right to make room. This will not move any columns if columnIndex equals newIndex. This method posts a columnMoved event to its listeners.
@param columnIndex the index of column to be moved
@param newIndex index of the column's new location
@exception IllegalArgumentException if columnIndex ornewIndex are not in the valid range
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