Description:
In Calc, when you create a dispersion chart and you want to set a fixed scale on one or both axis, you cannot set negative values anymore (this worked perfectly unlit 6.1.4). So it is impossible to get a correct fixed scale chart if you have totally or partially negative data to display

Steps to Reproduce:
1. Open a Calc sheet  and insert in column A and B some numbers for a few cells (say for 10 cells), some of them negative
2.  Now select the data and create a dispersion chart for them, choosing the appropriate type of chart.
3. Select one of the axes, and open the formatting dialog window at the "scale" tab. If you uncked the "automatic" option for the Minimum and Maximum fields, you should be able to set a fixed metric to the aixs
4. In the above input fields, any positive number is possible and works as expected; HOWEVER, the fields do not accept negative values anymore and it is thus impossible to have a fixed extremes dispersion chart displaying totally or partially negative values.

Actual Results:
If you input a negative value in the Minimum or Maximum field, when you press OK this is forced to 0 for any negative value you chose.
Notice that creating fixed extreme charts is often really necessary, especially when you have to compare different charts with similar data displayed. In these cases, if the extremes are left to automatic, they change and the charts are not comparable because their metrics are different.

Expected Results:
You should be able to set ANY value for the above fields, as happened until 6.1.4


Reproducible: Always


User Profile Reset: No



Additional Info: