text: public void UpdateFormulasAfterCellShift(FormulaShifter shifter, int externSheetIndex){for (int i = 0; i < _cfHeaders.Count; i++){CFRecordsAggregate subAgg = (CFRecordsAggregate)_cfHeaders[i];bool shouldKeep = subAgg.UpdateFormulasAfterCellShift(shifter, externSheetIndex);if (!shouldKeep){_cfHeaders.RemoveAt(i);i--;}}}