Admin: config for `all_models` from `iommi_admin.py` in apps don't apply

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I tried adding

class Meta:
    # [...]
    parts__all_models__parts__extra = html.h1(
        'asdasd',
        after=0,
    )

but that conf never gets to Admin.all_models

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Adding the conf on my Admin subclass doesn't seem to do it either...

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The workaround I came up with:

class MyAdmin(Admin):
    # [....]
    extra = html.h1(
        'asdasd',
        after=0,
        include=lambda request, **_: request.get_full_path().endswith('/admin/'),
    )