SAML2-SSO using autocreate is not tenant aware

[tom5850]

Using SAML2-SSO with activated autocreate, creates a new user always without tenant information.

That's because in iomadsaml2/classes/auth.php, line 748 the moodle core function is called, which is not aware of tenants:

$user->id = \user_create_user($user, true, true);

I suggest to replace this line with:
$companyid = iomad::get_my_companyid(context_system::instance(), false);
$user->companyid = $companyid;
$user->id = \company_user::create($user);