Implement PassThruChars to Argument

Closes: #9535.

src/Layout.cpp

@@ -994,6 +994,9 @@ void Layout::readArgument(Lexer & lex)
 			arg.font = lyxRead(lex, arg.font);
 		} else if (tok == "labelfont") {
 			arg.labelfont = lyxRead(lex, arg.labelfont);
+		} else if (tok == "passthruchars") {
+			lex.next();
+			arg.pass_thru_chars = lex.getDocString();
 		} else {
 			lex.printError("Unknown tag");
 			error = true;

src/Layout.h

@@ -104,6 +104,7 @@ public:
 		FontInfo font;
 		FontInfo labelfont;
 		bool autoinsert;
+		docstring pass_thru_chars;
 	};
 	///
 	typedef std::map<std::string, latexarg> LaTeXArgMap;

src/insets/InsetArgument.cpp

@@ -39,7 +39,7 @@ namespace lyx {
 InsetArgument::InsetArgument(Buffer * buf, string const & name)
     : InsetCollapsable(buf), name_(name), labelstring_(docstring()),
       font_(inherit_font), labelfont_(inherit_font), decoration_(string()),
-      pass_thru_(false)
+      pass_thru_(false), pass_thru_chars_(docstring())
 {}
 
 
@@ -112,6 +112,7 @@ void InsetArgument::updateBuffer(ParIterator const & it, UpdateType utype)
 		font_ = (*lait).second.font;
 		labelfont_ = (*lait).second.labelfont;
 		decoration_ = (*lait).second.decoration;
+		pass_thru_chars_ = (*lait).second.pass_thru_chars;
 	} else {
 		labelstring_ = _("Unknown Argument");
 		tooltip_ = _("Argument not known in this Layout. Will be supressed in the output.");
@@ -268,6 +269,8 @@ void InsetArgument::latexArgument(otexstream & os,
 	odocstringstream ss;
 	otexstream ots(ss, texrow);
 	OutputParams runparams = runparams_in;
+	if (!pass_thru_chars_.empty())
+		runparams.pass_thru_chars += pass_thru_chars_;
 	InsetText::latex(ots, runparams);
 	docstring str = ss.str();
 	docstring const sep = str.empty() ? docstring() : from_ascii(", ");

src/insets/InsetArgument.h

@@ -97,6 +97,8 @@ private:
 	std::string decoration_;
 	///
 	bool pass_thru_;
+	///
+	docstring pass_thru_chars_;
 
 protected:
 	/// \name Protected functions inherited from Inset class

src/insets/InsetLayout.cpp

@@ -620,6 +620,9 @@ void InsetLayout::readArgument(Lexer & lex)
 			arg.font = lyxRead(lex, arg.font);
 		} else if (tok == "labelfont") {
 			arg.labelfont = lyxRead(lex, arg.labelfont);
+		} else if (tok == "passthruchars") {
+			lex.next();
+			arg.pass_thru_chars = lex.getDocString();
 		} else {
 			lex.printError("Unknown tag");
 			error = true;