Prior to this change, if a contenteditable=true element was a child of a
contenteditable=false element, it was always flagged as unremovable=true.
In fact what should happen is that this.editable should be unremovable, but one
of its subchildren can be contenteditable=true while having a parent
contenteditable=false and not be unremovable.
Task-id: 2794990
X-original-commit: 72e2fd7439a0d6e44b5082def35079019371a3b7
Part-of: odoo/odoo#88733
abd-msyukyu-odoo
42a42ebcfb