// copy attributes, as they might be removed by merging with the new column
// TODO: check if this fix is really necessary or if the sweeping algorithm
// in addCleanColIntoCols needs to be adapted ...
CTCol fixCol_before = this.columnHelper.getColumn1Based(toColumn, false);
if (fixCol_before != null) {
fixCol_before = (CTCol)fixCol_before.copy();
}
ctCol.setMin(fromColumn);
ctCol.setMax(toColumn);
this.columnHelper.addCleanColIntoCols(ctCols, ctCol);