[LyX/master] Forgot this.

[Juergen Spitzmueller]

commit 9162a3f40e74efe2cc663e884bac651c4a677ac4
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Fri May 8 09:51:09 2015 +0200

    Forgot this.

diff --git a/src/Layout.cpp b/src/Layout.cpp
index e01b21e..cb1f69b 100644
--- a/src/Layout.cpp
+++ b/src/Layout.cpp
@@ -1046,6 +1046,8 @@ void writeArgument(ostream & os, string const & id, 
Layout::latexarg const & arg
                lyxWrite(os, arg.font, "Font", 2);
        if (arg.labelfont != inherit_font)
                lyxWrite(os, arg.labelfont, "LabelFont", 2);
+       if (!arg.pass_thru_chars.empty())
+               os << "\t\tPassThruChars \"" << to_utf8(arg.pass_thru_chars) << 
"\"\n";
        os << "\tEndArgument\n";
 }