Comment 15 for bug 642529

Thanks for your test rsx11m, I will do some additional unit tests only with the serializer and the flag nsIDocumentEncoder::OutputFormatted, so I could verify if the issue is really inside the serializer. (If I'm not wrong, the initial call is here http://mxr.mozilla.org/comm-1.9.2/source/mailnews/compose/src/nsMsgCompose.cpp#1072 )