Closes#22274.
This assertion was added in 4b903c5dcd
where it may have made sense, because indeed when doing realm creation
there was always a PreregistrationUser (created because realms were
created via going to a generated realm creation link). With the addition
of the create_realm command that's no longer the case.
It would be unnatural to create a PreregistrationUser in the
realm_creation command, because there is no confirmation link for it to
be tied to - and it just doesn't make sense conceptually.
The intended, correct behavior added in
4b903c5dcd is still maintained - the code
lower down correctly handles the
(prereg_user is None and realm_creation) case.
This commit changes the code to always pass delivery_email
field in the user's own object in 'realm_users'.
This commit also fixes the events sent by notify_created_user.
In the "realm_user/add" event sent when creating the user,
the delivery_email field was set according to the access
for the created user itself as the created user was passed as
acting_user to format_user_row. But now since we have changed
the code to always allow the user themselves to have access
to the email, this bug was caught in tests and we fix the person
object in the event to have delivery_email field based on whether
the user receiving the event has access to email or not.
This commit reads the browser locale during user registration, and
sets it as default language of user if it is supported by Zulip.
Otherwise, it is set to realm's default language.
Mateusz Mandera
Sahil Batra
Siddharth Asthana
Anders Kaseorg