Add the possibility to flag a HTML field as `sanitize_overridable`.
The sanitizer will then be bypassed if the user doing the operation is
part of the new group `base.group_sanitize_override`.
The "Settings" users are part of that new group.
If such a user wrote some HTML that would have normally been removed by
the sanitizer, then users without the right to bypass the sanitizer
won't be able to write on that field anymore.
Otherwise, it would sanitize the previously written data.
Such cases are detected, and the modification prevented by the system,
which will warn the user about it.
For instance, with a `field.html(sanitize_overridable=True)`: one being
part of `group_sanitize_override` could write `<script></script>`.
Then, someone not part of the group trying to add an element inside that
field like appending a `<p/>` -> `<script></script><p>New Content</p>`
would not be able to because it would go through the sanitizer and
ultimately, removing part of the original value:
`<p>New Content</p>` (`<script></script>` would be removed).
== Real use case ==
In the website builder, there is 2 editor rights:
- group_website_publisher: restricted editor
- group_website_designer: editor & designer
The designer editor can edit pages and views, while the restricted
editor can't do anything unless he is part of other groups.
In edit mode, the restricted editor will only be able to edit fields of
record he has access to.
For instance, being a sales manager allows you to edit a product
description on the website.
Being an event manager -> edit event. Slide manager -> Slides etc.
As those restricted editor are able to edit those fields, they are
(almost) always sanitized to prevent them to introduce malicious code.
Since those fields are sanitized, even admins / designer editor are not
able to fully use the website builder in such fields.
Some clients don't really care about that sanitation, they'd prefer to
avoid it as they trust their manager and would prefer to have the full
builder capability instead.
This is typically the case in small project (butcher, hairdresser,
reseller etc) and in SMEs.
With the new `sanitize_overridable` feature, they will be able to do
that, as the "Designer & Editor" group now also receive the group
`base.group_sanitize_override` (done in next commit).
Part-of: odoo/odoo#97398
Romain Derie
cf844e34dd