Protect TeX double quotes ligatures in inline literals (refs #3507)

sphinx/texinputs/sphinx.sty

@@ -1243,6 +1243,10 @@
 \protected\def\sphinxstyleabbreviation   {\textsc}
 \protected\def\sphinxstyleliteralintitle {\sphinxcode}
 
+% LaTeX writer uses macros to hide double quotes from \sphinxcode's \@noligs
+\protected\def\sphinxquotedblleft{``}
+\protected\def\sphinxquotedblright{''}
+
 % stylesheet for highlighting with pygments
 \RequirePackage{sphinxhighlight}
 

sphinx/writers/latex.py

@@ -2209,7 +2209,9 @@ class LaTeXTranslator(nodes.NodeVisitor):
     def visit_Text(self, node):
         text = self.encode(node.astext())
         if not self.no_contractions and not self.in_parsed_literal:
-            text = educate_quotes_latex(text)
+            text = educate_quotes_latex(text,
+                                        dquotes=("\\sphinxquotedblleft{}",
+                                                 "\\sphinxquotedblright{}"))
         self.body.append(text)
 
     def depart_Text(self, node):