BUG: Fix autosummary of members with a trailing underscore

tests/roots/test-autosummary/contents.rst

@@ -4,4 +4,5 @@
    :toctree:
 
    dummy_module
+   underscore_module_
    sphinx

tests/roots/test-autosummary/underscore_module_.py

@@ -0,0 +1,12 @@
+"""
+module with trailing underscores everywhere
+"""
+class class_(object):
+    """ Class """
+    def method_(_arg):
+        """ Method """
+        pass
+
+def function_(_arg):
+    """ Function """
+    pass

tests/test_ext_autosummary.py

@@ -13,6 +13,8 @@ from six import iteritems, StringIO
 
 from sphinx.ext.autosummary import mangle_signature
 
+from util import etree_parse
+
 import pytest
 
 html_warnfile = StringIO()
@@ -103,3 +105,24 @@ def test_get_items_summary(app, status, warning):
                   'Test function take an argument ended with underscore.',
                   'dummy_module.func')
     assert autosummary_items['func'] == func_attrs
+
+def str_content(elem):
+    if elem.text is not None:
+        return elem.text
+    else:
+        return ''.join(str_content(e) for e in elem)
+
+@pytest.mark.sphinx('xml', **default_kw)
+def test_escaping(app, status, warning):
+    from xml.etree import ElementTree
+
+    app.builder.build_all()
+
+    outdir = app.builder.outdir
+
+    docpage = outdir / 'underscore_module_.xml'
+    assert docpage.exists()
+
+    title = etree_parse(docpage).find('section/title')
+
+    assert str_content(title) == 'underscore_module_'