[FIX] website: dynamic snippet, use lxml.html to process rendered view

t-field of a Text field, will use nl2br function that replace \n to <br>.
So it is html that we need to parse.

Add one return line in your sale description, and the rendering will fail
with an error opening and ending missmatch for br...

closes odoo/odoo#77108

X-original-commit: 3b3f9b24362e57b4c1538d8377ef4de5f3d65058
Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

addons/website/models/website_snippet_filter.py

@@ -5,8 +5,7 @@ from collections import OrderedDict
 from odoo import models, fields, api, _
 from odoo.exceptions import ValidationError, MissingError
 from odoo.osv import expression
-from odoo.tools import html_escape as escape
-from lxml import etree as ET
+from lxml import etree, html
 import logging
 from random import randint
 
@@ -77,7 +76,7 @@ class WebsiteSnippetFilter(models.Model):
             records=records,
             is_sample=is_sample,
         ))
-        return [ET.tostring(el, encoding='unicode') for el in ET.fromstring('<root>%s</root>' % str(content)).getchildren()]
+        return [etree.tostring(el, encoding='unicode') for el in html.fromstring('<root>%s</root>' % str(content)).getchildren()]
 
     def _prepare_values(self, limit=None, search_domain=None):
         """Gets the data and returns it the right format for render."""