In mass mailing there is several possibilities of states when rendering
the widget with a possibly new value:
1. we are not in edition
a. we are in same language than user language => the editor content
can be updated
b. we are in a different language => the content cannot be updated
2. we are in edition
a. we are editing translation : the editor content cannot be updated
b. we are not editing translation (editor language == en_US)
i. we are requesting editor update (by having magic value
`on_change_model_and_list`) => the editor can be updated
ii. we are in same language than user language => the editor content
can be updated
iii. we are in a different language => the editor content cannot be
updated
In summary:
- if language is the same than the user, we can update the value
- if value is magic `on_change_model_and_list` and we are not translating,
we can update the editor
Before this commit, this worked as expected but for 2.a.ii. which if the
user language was not en_US would for example prevent editor updating.
closes#15583closes#15414
opw-708032
inspired by a27e24c6d1
note: the fix is a fix for 9.0 and saas-11 only.