some index fixes:

* src/insets/InsetIndex.{cpp,h} reimplement ::latex in order to:
	- un-\protect the index entry (fixes bug 4600).
	- handle formatted index entries (bug 4800). 

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@24513 a592a061-630c-0410-9148-cb99ea01b6c8

src/insets/InsetIndex.cpp

@@ -40,6 +40,21 @@ InsetIndex::InsetIndex(Buffer const & buf)
 {}
 
 
+int InsetIndex::latex(odocstream & os,
+			  OutputParams const & runparams) const
+{
+	os << "\\index";
+	os << '{';
+	if (hasFontChanges()) {
+		InsetText::plaintext(os, runparams);
+		os << '@';
+	}
+	int i = InsetText::latex(os, runparams);
+	os << '}';
+	return i;
+}
+
+
 int InsetIndex::docbook(odocstream & os, OutputParams const & runparams) const
 {
 	os << "<indexterm><primary>";
@@ -68,6 +83,16 @@ void InsetIndex::addToToc(ParConstIterator const & cpit) const
 }
 
 
+bool InsetIndex::hasFontChanges() const
+{
+	// we only have one par
+	Paragraph par = paragraphs().back();
+	FontSpan const font_span = par.fontSpan(0);
+	Font firstfont = par.getFirstFontSettings(buffer().params());
+	return (firstfont.fontInfo() != inherit_font || par.size() > font_span.last + 1);
+}
+
+
 /////////////////////////////////////////////////////////////////////
 //
 // InsetPrintIndex

src/insets/InsetIndex.h

@@ -36,12 +36,16 @@ private:
 	void write(std::ostream & os) const;
 	///
 	int docbook(odocstream &, OutputParams const &) const;
+	///
+	int latex(odocstream &, OutputParams const &) const;
 	/// should paragraph indendation be omitted in any case?
 	bool neverIndent() const { return true; }
 	///
 	void addToToc(ParConstIterator const &) const;
 	///
 	Inset * clone() const { return new InsetIndex(*this); }
+	///
+	bool hasFontChanges() const;
 };