In some cases, when sorting data in calc, the single lines are not correctly kept together but instead 
elements belonging to one line end up in a different line after sorting. For example, in the following
case:
            columnA     columnB
Line 1       12             =A1*5
Line 2        4                   7
Line 3       57              =A3*5

after sorting by column A in ascending order, we obtain:

            columnA     columnB
Line 1        4                   7
Line 2       12              =A1*5
Line 3       57              =A3*5

Note that element B2 should correctly be =A2*5, but instead it is =A1*5.
This bug is very dangerous because it manipulates the data in the spreadsheet
in an an incorrect way, and the user may not notice that. This is extremely
dangerous especially if calc is used for structural or financial calculations.
Please correct this issue rapidly!