(core) ensure the output path is created in io::session::SWriter
Description
- Ensure the output path is created in io::session::SWriter when it is computed (and not user-selected)
Functional specifications
- Allow programmatically saving the session
Technical specifications
- Ensure the output path is created in io::session::SWriter when it is computed (and not user-selected), notably via the setPrefix slot
Test plan
- Add unit test using the setPrefix slot in SWriter