FlatPages get_absolute_url should pay attention to script prefix

[Gunnar Scherf]

When hosting a django app under a subpath of a domain, then get_absolute_url returns the url without the subpath.

    def get_absolute_url(self):
        return self.url

Better would be if the subpath is recognized

    def get_absolute_url(self):
        absolute_url = "%s%s" % (get_script_prefix().rstrip('/'), self.url)
        return absolute_url

[Aymeric Augustin]

Yes, this is necessary because flatpages bypass the URL resolver (and specifically the reverse function) entirely.

[Aymeric Augustin <aymeric.augustin@…>]

In a44531ae1592cf266e6c24387f49d665c639b480:

Fixed #18862 -- Honored script prefix in FlatPage.get_absolute_url.