Commit e834173314f00e36cb3a1f99690d9f220584682c fixed an issue where editable
elements could not be removed if they were nested in a non-editable element,
because the editor considered them to be an editable root.
However, the same logic also applied when doing a history step after adding
such an element. Adding a nested editable element would make the history step
invalid and result in a rollback.
Such a situation can be encountered when adding a recaptcha legal notice to a
website form. The footer of the form is a non-editable paet of the document,
however the legal notice can still be updated by the user. This commit adds a
separate test for the addition of such editable elements that were previously
considered unremovable.
opw-2723017
closesodoo/odoo#88733
X-original-commit: f693e8ed27f753a728d903dfe4d7d10ae1334526
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>