I added regression tests a while ago testing if older pet files that only saved parameters of one model were still correctly loaded, but probably while updating the version of the pet file the test files also got the new syntax, effectively making the tests pointless.
So I reversed the changes and remade the pet files in the old version and syntax.
Reviewer Checklist
General code quality
naming conventions are met (see .clang-tidy for detailed information)
no static analyzer warnings in new code parts (e.g., use clang-tidy for checking)
General usability
old versions of pet-files are still loadable
documentation updated (if applicable)
Only if changes in UI
new elements are also saved and loaded from pet-file
