plugin XEP-0277: removed cleanXHTML on output data:

- while it is mandatory to clean input data, output data sent by frontends should and need to be clean
    - cleaning all output data means that we can't send be sure that all the XHTML we send is not modified
    - it's a waste of resources as cleaning today reparse the data with lxml
    - behaviour may change in the future (e.g. having an option to use cleaning on output data)

src/plugins/plugin_xep_0277.py

@@ -364,8 +364,6 @@ class XEP_0277(object):
                             converted = yield synt.convert(data[attr], synt.getCurrentSyntax(profile), "XHTML")
                             if '{}_xhtml'.format(elem_name) in data:
                                 raise failure.Failure(exceptions.DataError(_("Can't have xhtml and rich content at the same time")))
-                        else:  # clean the XHTML input
-                            converted = yield synt.cleanXHTML(data[attr])
 
                         xml_content = u'<div xmlns="{ns}">{converted}</div>'.format(
                                         ns=NS_XHTML,