During `to_inline` process, the document will be transformed to be email friendly. This can add some `<!-- mso -->` comment into the document. These comments nodes will create issues during future edition, if we keep them in the editable. So we add a sanitize step to remove all comments nodes. task-3222474 closes odoo/odoo#124020 X-original-commit: b85a29d9ba36aaaa90e514ba45d1054b693a26e2 Signed-off-by: David Monjoie (dmo) <dmo@odoo.com> Signed-off-by: Geelen Sébastien (sge) <sge@odoo.com>