protected Object getColumnValue(T t) {
		return model.getColumnValueForRow(t, sortColumn);
	}
A special version of the backup comparator that uses the column's rendered value for 
the backup sort, rather the just <code>toString</code>, which is what the default parent
table model will do.

@param <T> the row type
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/sort/ColumnRenderedValueBackupComparator.java