To fix a memory leak when doing a indexed sort, I added the ClearCells line that SortData does before removing the pivot row to the SortIndexed procedure.
// remove pivot row space
ClearCells(CellRange(0,RowCount - 1, ColumnCount - 1, RowCount - 1));
FRowCount := FRowCount - 1;
You're correct about this. The fix is applied and will be in the next release.