Export in the same drawer as the project file

[pferrucci]

When trying to export, the app opens the last used drawer. When in real life, one always writes to the same drawer?

I suggest the app opens the file requester on the same (i.e. source) drawer.

If you want to keep the old functionnality, you can make the "export" menu item to export to the source drawer, and add a new "export to" menu item to open the last used drawer.