LaTeX reader: allow verbatim blocks ending with blank lines.

Closes #4624.

src/Text/Pandoc/Readers/LaTeX.hs

@@ -2145,7 +2145,20 @@ verbEnv name = withVerbatimMode $ do
   skipopts
   optional blankline
   res <- manyTill anyTok (end_ name)
-  return $ stripTrailingNewlines $ toksToString res
+  return $ T.unpack
+         $ stripTrailingNewline
+         $ untokenize
+         $ res
+
+-- Strip single final newline and any spaces following it.
+-- Input is unchanged if it doesn't end with newline +
+-- optional spaces.
+stripTrailingNewline :: Text -> Text
+stripTrailingNewline t =
+  let (b, e) = T.breakOnEnd "\n" t
+  in  if T.all (== ' ') e
+         then T.dropEnd 1 b
+         else t
 
 fancyverbEnv :: PandocMonad m => Text -> LP m Blocks
 fancyverbEnv name = do

test/command/4624.md

@@ -0,0 +1,30 @@
+```
+% pandoc -f latex -t native
+\begin{Verbatim}[key1=value1]
+code1
+
+\end{Verbatim}
+
+
+\begin{lstlisting}[key2=value2]
+code2
+  
+\end{lstlisting}
+
+\begin{verbatim}
+code3
+\end{verbatim}
+
+\begin{verbatim}
+code4
+    \end{verbatim}
+
+\begin{verbatim}
+code5\end{verbatim}
+^D
+[CodeBlock ("",[],[("key1","value1")]) "code1\n"
+,CodeBlock ("",[],[("key2","value2")]) "code2\n  "
+,CodeBlock ("",[],[]) "code3"
+,CodeBlock ("",[],[]) "code4"
+,CodeBlock ("",[],[]) "code5"]
+```