xml_tools, plugin XEP-0071, XEP-0277: add method expandNewLinesToXHTML:

- \n in XHTML content should not be converted to <br /> by the frontend
    - save it directly in the Atom payload for better compatibility with other clients

src/plugins/plugin_xep_0071.py

@@ -22,6 +22,7 @@ from sat.core import exceptions
 from sat.core.log import getLogger
 log = getLogger(__name__)
 
+from sat.tools import xml_tools
 from wokkel import disco, iwokkel
 from zope.interface import implements
 # from lxml import etree
@@ -118,6 +119,7 @@ class XEP_0071(object):
                 raise exceptions.DataError(_("Can't have xhtml and rich content at the same time"))
         if xhtml:
             d = self.synt_plg.clean_xhtml(xhtml)
+            d.addCallback(xml_tools.expandNewLinesToXHTML)
         d.addCallback(syntax_converted)
         return d