Patch by John McCabe-Dansted to fix bug #6502:

Wrong line count with parent math macros:

* TeXRow.{cpp,h}:
	- new helper function to insert multiple newline at once.

* mathed/MacroTable.{cpp,h}:
* mathed/MacroTemplate.{cpp,h}:
	- make write() an int, returning number of newlines

* Buffer.cpp (writeLaTeXSource):
	- update texrow's newline on parent macro output.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_1_6_X@33368 a592a061-630c-0410-9148-cb99ea01b6c8

src/Buffer.cpp

@@ -1213,8 +1213,11 @@ void Buffer::writeLaTeXSource(odocstream & os,
 		// output the parent macros
 		MacroSet::iterator it = parentMacros.begin();
 		MacroSet::iterator end = parentMacros.end();
-		for (; it != end; ++it)
-			(*it)->write(os, true);
+		for (; it != end; ++it) {
+			int num_lines = (*it)->write(os, true);
+			d->texrow.newlines(num_lines);
+		}
+		
 	} // output_preamble
 
 	d->texrow.start(paragraphs().begin()->id(), 0);

src/TexRow.cpp

@@ -44,6 +44,12 @@ void TexRow::newline()
 	rowlist.push_back(tmp);
 }
 
+void TexRow::newlines(int num_lines)
+{
+	for (int i = 0; i < num_lines; ++i) {
+		newline();
+	}
+}
 
 bool TexRow::getIdFromRow(int row, int & id, int & pos) const
 {

src/TexRow.h

@@ -37,6 +37,9 @@ public:
 	/// Insert node when line is completed
 	void newline();
 
+	/// Insert multiple nodes when zero or more lines are completed
+	void newlines(int num_lines);
+
 	/**
 	 * getIdFromRow - find pid and position for a given row
 	 * @param row row number to find

src/mathed/MacroTable.cpp

@@ -151,7 +151,7 @@ void MacroData::updateData() const
 }
 	
 
-void MacroData::write(odocstream & os, bool overwriteRedefinition) const
+int MacroData::write(odocstream & os, bool overwriteRedefinition) const
 {
 	updateData();
 
@@ -159,14 +159,14 @@ void MacroData::write(odocstream & os, bool overwriteRedefinition) const
 	Inset * inset = pos_.nextInset();
 	if (inset == 0 || inset->lyxCode() != MATHMACRO_CODE) {
 		lyxerr << "BUG: No macro template found by MacroData" << endl;
-		return;
+		return 0;
 	}
 		
 	// output template
 	MathMacroTemplate const & tmpl =
 		static_cast<MathMacroTemplate const &>(*inset);
 	WriteStream wi(os, false, true, WriteStream::wsDefault);
-	tmpl.write(wi, overwriteRedefinition);
+	return tmpl.write(wi, overwriteRedefinition);
 }
 
 

src/mathed/MacroTable.h

@@ -81,7 +81,7 @@ public:
 	MacroType & type() { return type_; }
 	
 	/// output as TeX macro, only works for lazy MacroData!!!
-	void write(odocstream & os, bool overwriteRedefinition) const;
+	int write(odocstream & os, bool overwriteRedefinition) const;
 
 	///
 	bool operator==(MacroData const & x) const {

src/mathed/MathMacroTemplate.cpp

@@ -1150,8 +1150,10 @@ void MathMacroTemplate::write(WriteStream & os) const
 }
 
 
-void MathMacroTemplate::write(WriteStream & os, bool overwriteRedefinition) const
+int MathMacroTemplate::write(WriteStream & os, bool overwriteRedefinition) const
 {
+	int num_lines = 0;
+
 	if (os.latex()) {
 		if (optionals_ > 0) {
 			// macros with optionals use the xargs package, e.g.:
@@ -1214,11 +1216,16 @@ void MathMacroTemplate::write(WriteStream & os, bool overwriteRedefinition) cons
 	if (os.latex()) {
 		// writing .tex. done.
 		os << "\n";
+		++num_lines;
 	} else {
 		// writing .lyx, write special .tex export only if necessary
-		if (!cell(displayIdx()).empty())
+		if (!cell(displayIdx()).empty()) {
 			os << "\n{" << cell(displayIdx()) << '}';
+			++num_lines;
+		}
 	}
+
+	return num_lines;
 }
 
 

src/mathed/MathMacroTemplate.h

@@ -49,7 +49,7 @@ public:
 	void write(WriteStream & os) const;
 	/// Output LaTeX code, but assume that the macro is not definied yet
 	/// if overwriteRedefinition is true
-	void write(WriteStream & os, bool overwriteRedefinition) const;
+	int write(WriteStream & os, bool overwriteRedefinition) const;
 	///
 	int plaintext(odocstream &, OutputParams const &) const;
 	///