When the mechanism that synchronise odoo fields contained an
unremovable, even though no unremovable got removed, the Odoo editor
would rollback as the syncing mechanism would set innerHTML to the
synced nodes, which would remove the unremovable. To prevent the
rollback in that kind of circumstance, this commit introduce a new
method on the OdooEditor `withoutRollback`.
task-3436834
closesodoo/odoo#129320
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>