Pandoc writer: fix spacing inside EDelimited.

Previously spaces around binary operators were omitted when
they occurred inside parens or brackets.  See #234.

src/Text/TeXMath/Writers/Pandoc.hs

@@ -99,8 +99,8 @@ expToInlines tt (EIdentifier s) = Just $ renderStr tt s
 expToInlines tt (EMathOperator s) = Just $ renderStr tt s
 expToInlines tt (ESymbol _ s) = Just $ renderStr tt s
 expToInlines tt (EDelimited start end xs) = do
-  xs' <- mapM (either (return . renderStr tt) (expToInlines tt)) xs
-  return $ renderStr tt start ++ concat xs' ++ renderStr tt end
+  xs' <- expsToInlines tt $ map (either (ESymbol Ord) id) xs
+  return $ renderStr tt start ++ xs' ++ renderStr tt end
 expToInlines tt (EGrouped xs)    = expsToInlines tt xs
 expToInlines _ (EStyled tt' xs)  = expsToInlines (Just tt') xs
 expToInlines _ (ESpace n)        = Just [Str $ getSpaceChars n]

test/regression/234.test

@@ -0,0 +1,24 @@
+<<< native
+[ ENumber "2"
+, ESymbol Bin "+"
+, EDelimited
+    "("
+    ")"
+    [ Right (ENumber "2")
+    , Right (ESymbol Bin "+")
+    , Right (ENumber "3")
+    ]
+]
+>>> pandoc
+[ Str "2"
+, Str "\8197"
+, Str "+"
+, Str "\8197"
+, Str "("
+, Str "2"
+, Str "\8197"
+, Str "+"
+, Str "\8197"
+, Str "3"
+, Str ")"
+]