Fixed mixed text and elements bug in tostring.

XML of the form <a>foo <b>bar</b> baz</a> was outputted as
<a>foo <b>bar</b> baz baz</a>.

Includes unit test.

sleekxmpp/xmlstream/tostring/tostring26.py

@@ -68,9 +68,6 @@ def tostring(xml=None, xmlns='', stanza_ns='', stream=None, outbuffer=''):
             for child in xml.getchildren():
                 output.append(tostring(child, tag_xmlns, stanza_ns, stream))
         output.append(u"</%s>" % tag_name)
-        if xml.tail:
-            # If there is additional text after the element.
-            output.append(xml_escape(xml.tail))
     elif xml.text:
         # If we only have text content.
         output.append(u">%s</%s>" % (xml_escape(xml.text), tag_name))

tests/test_tostring.py

@@ -73,6 +73,16 @@ class TestToString(SleekTest):
             message="The xmlns parameter was not used properly.",
             xmlns='foo')
 
+    def testTailContent(self):
+        """
+        Test that elements of the form <a>foo <b>bar</b> baz</a> only
+        include " baz" once.
+        """
+        self.tryTostring(
+            original='<a>foo <b>bar</b> baz</a>',
+            message='Element tail content is incorrect.')
+
+
     def testStanzaNs(self):
         """
         Test using the stanza_ns tostring parameter, which will prevent