Fix #3960: default_role = guilabel not functioning

CHANGES

@@ -21,7 +21,8 @@ Bugs fixed
 
 * #3924: docname lost after dynamically parsing RST in extension
 * #3946: Typo in sphinx.sty (this was a bug with no effect in default context)
-* Fix :pep: and :rfc: does not supports ``default-role`` directive (refs: #3960)
+* :pep: and :rfc: does not supports ``default-role`` directive (refs: #3960)
+* #3960: default_role = 'guilabel' not functioning
 
 Testing
 --------

sphinx/roles.py

@@ -189,6 +189,7 @@ def indexmarkup_role(typ, rawtext, text, lineno, inliner, options={}, content=[]
         typ = env.temp_data['default_role'].lower()
     else:
         typ = typ.lower()
+
     has_explicit_title, title, target = split_explicit_title(text)
     title = utils.unescape(title)
     target = utils.unescape(target)
@@ -250,6 +251,13 @@ _amp_re = re.compile(r'(?<!&)&(?![&\s])')
 
 def menusel_role(typ, rawtext, text, lineno, inliner, options={}, content=[]):
     # type: (unicode, unicode, unicode, int, Inliner, Dict, List[unicode]) -> Tuple[List[nodes.Node], List[nodes.Node]]  # NOQA
+    env = inliner.document.settings.env
+    if not typ:
+        assert env.temp_data['default_role']
+        typ = env.temp_data['default_role'].lower()
+    else:
+        typ = typ.lower()
+
     text = utils.unescape(text)
     if typ == 'menuselection':
         text = text.replace('-->', u'\N{TRIANGULAR BULLET}')
@@ -281,6 +289,13 @@ _litvar_re = re.compile('{([^}]+)}')
 def emph_literal_role(typ, rawtext, text, lineno, inliner,
                       options={}, content=[]):
     # type: (unicode, unicode, unicode, int, Inliner, Dict, List[unicode]) -> Tuple[List[nodes.Node], List[nodes.Node]]  # NOQA
+    env = inliner.document.settings.env
+    if not typ:
+        assert env.temp_data['default_role']
+        typ = env.temp_data['default_role'].lower()
+    else:
+        typ = typ.lower()
+
     text = utils.unescape(text)
     pos = 0
     retnode = nodes.literal(role=typ.lower(), classes=[typ])