[TMP] mail: temporarily deactivate keep_url

This makes every template holding images crash. As this feature will shortly be
fixed in 9, let us temporarily comment its use and wait for the forward port of
the fix.

addons/mail/models/mail_thread.py

@@ -1620,8 +1620,10 @@ class MailThread(models.AbstractModel):
         # 1: Handle content subtype: if plaintext, converto into HTML
         if content_subtype == 'plaintext':
             body = tools.plaintext2html(body)
-        else:
-            body = tools.html_keep_url(body)
+        # TMP: do not rewrite URLs in html because it creates errors. A fix is
+        # pending in 9, so this code is temporarily deactivated.
+        # else:
+        #     body = tools.html_keep_url(body)
 
         # 2: Private message: add recipients (recipients and author of parent message) - current author
         #   + legacy-code management (! we manage only 4 and 6 commands)