Documented that m2m_changed isn't triggered when M2M is displayed as admin inline.

to *not* display this widget - otherwise you will end up with two widgets on

your admin page for managing the relation.

Note that when using this technique the

:data:`~django.db.models.signals.m2m_changed` signals aren't triggered. This

is because as far as the admin is concerned, ``through`` is just a model with

two foreign key fields rather than a many-to-many relation.

In all other respects, the ``InlineModelAdmin`` is exactly the same as any

other. You can customize the appearance using any of the normal

``ModelAdmin`` properties.