[Qt-interest] Restoring sorting of QTableView

[RZ]

Hi,

i got a somewhat simple problem one might think but I did not find an 
elegant solution.
I'm reading a file and appending each line as a new row in my model. 
Each row is parsed while reading so I end up having a table with several 
columns and the ordering of the lines is "natural" (that is as they are 
in the file). The rows can be sorted and filtered (via 
QSortFilterProxyModel) which works just fine.
But: how to restore the original ordering of the data? Because if the 
user clicks e.g. column B data will be sorted accordingly but there is 
no way to "unsort" (read: present the data as it was before sorting when 
loaded).
Interestingly the line numbers of the vertical header view are also 
"sorted" - so one might think that there must be a way to represent the 
data according to the numbers of the lines in the header view but I 
didn't find anything about it. Of course I could have a column holding 
the line number and present that to the user - but this would be nothing 
different than reimplementing the vertical header view myself ...

Does anyone know about a more elegant solution?

Regards,

Roland