Fix parsing of verbatim options (bug #9113)

Parser::verbatimOption() did swallow backslashes previously. The similar code
in Parser::verbatim_item() was already correct.

src/tex2lyx/Parser.cpp

@@ -704,7 +704,7 @@ string Parser::verbatimOption()
 				putback();
 				res += '{' + verbatim_item() + '}';
 			} else
-				res += t.cs();
+				res += t.asInput();
 		}
 	}
 	return res;

src/tex2lyx/test/test-insets.lyx.lyx

@@ -707,6 +707,28 @@ key "gur+04"
 
 \begin_layout Bibliography
 
+\begin_inset CommandInset bibitem
+LatexCommand bibitem
+label "Möstl et~al.(2010)"
+key "Mostl2010"
+
+\end_inset
+
+ Gürkan, M.
+\begin_inset space ~
+
+\end_inset
+
+A., Freitag, M., & Rasio, F.
+\begin_inset space ~
+
+\end_inset
+
+A. 2004, ApJ, 604, 632 
+\end_layout
+
+\begin_layout Bibliography
+
 \begin_inset CommandInset bibitem
 LatexCommand bibitem
 label "{{Gürkan et~al.}(2004)}"

src/tex2lyx/test/test-insets.tex

@@ -141,6 +141,8 @@ From bug 7306:
 \citet{gur+04} have demonstrated that authors should not have umlauts
 in their names. It's OK to use them in the man\"{u}script, though.
 \begin{thebibliography}{References}
+\bibitem[M\"{o}stl et~al.(2010)]{Mostl2010} Gürkan, M.~A., Freitag,
+M., \& Rasio, F.~A. 2004, ApJ, 604, 632
 \bibitem[{{G\"{u}rkan et~al.}(2004)}]{gur+04} Gürkan, M.~A., Freitag,
 M., \& Rasio, F.~A. 2004, ApJ, 604, 632\end{thebibliography}