Please provide a session-scope 'settings' fixture

I wish it was as easy as this:

@pytest.fixture(scope="session")
def session_settings():
    """A Django settings object which restores changes after the test session"""
    skip_if_no_django()

    wrapper = SettingsWrapper()
    yield wrapper
    wrapper.finalize()

Unfortunately it's not, because SettingsWrapper._to_restore is a class attributes, rather than an instance attribute. So if you have any of the original settings fixture in your code, when those call finalize, they'll remove your session-scoped settings changes, too.

This should be an easy fix, tho: just make SettingsWrapper._to_restore an instance attribute, so that there can be multiple different SettingsWrappers in use at the same time, without interfering with each other.

Start with SettingsWrapper and the existing settings fixture usage described in the issue; inspect how _to_restore is managed through finalization. Done means multiple SettingsWrapper instances keep independent restoration state, including the session-scoped use case, and the relevant fixture tests pass.