The Nixpkgs wrapper now applies appDataDir, so a custom configPath
changes the Firefox and Floorp derivations. Test package identity with
each browser default and leave custom paths to the config-path tests.
Use `lib.hm.deprecations.mkStateVersionOptionDefault` to keep the legacy `.mozilla/firefox` default for existing configurations while switching new Linux configurations to `"${config.xdg.configHome}/mozilla/firefox"`.
Add focused tests for the legacy and XDG defaults plus a news entry describing the transition.
Closes#8200.
Supersedes #8716 and the earlier attempt in #8672.
Co-authored-by: Heitor <44377258+HeitorAugustoLN@users.noreply.github.com>
Instead of having to manually stub packages that should not be
downloaded we instead automatically stub all packages (except a small
list of whitelisted ones). Tests can re-introduce the real package by
using the `realPkgs` module argument.
When `cfg.package` is already wrapped, and wrapped without the
`ExtensionSettings` key set, this would always add that key, even if its
value was blank. This would result in `cfg.finalPackage` being a
functionally-identical, but differently-input-addressed package. This is
generally undesirable as it may result in multiple derivations being
built, and also if the value of `cfg.package` is expected to be
unchanged by the user (e.g. because they want it to be consistent
between NixOS and HM configuration).
Add a test to ensure this does not regress in the default case. Only
test on newish stateVersion since the logic for `isWrapped` differs on
older versions.
