#409 Cannot fit two different data ranges from the same dataset

[Miguel Agueda]

I can't do two different fits to a data set on different data range.
To reproduce:
Right click Y column -> Plot ->Scatter=>Add/Remove Curve...->Enable Show Range->Edit Range... (take the a range=>Add same data from the avaliable data->Edit range... (take a different range that doesn't overlap)->OK
Now in the graph: Fit Linear (for example, it happens with Fit Wizard as well)-> Select data (they both have the exact same name).
If you try to make a fit again, no matter what data you choose, it'll always take the first data range defined.
Tested using SciDAVis 2.3.0 on either Windows 10 2004 or Fedora 33 with fedora repo package