[patch] fix bug 2932

[Georg Baum]

See http://bugzilla.lyx.org/show_bug.cgi?id=2932. This goes in tomorrow 
unless I get objections.


Georg

Index: src/mathed/InsetMathGrid.C
===================================================================
--- src/mathed/InsetMathGrid.C	(Revision 17470)
+++ src/mathed/InsetMathGrid.C	(Arbeitskopie)
@@ -113,7 +113,7 @@ InsetMathGrid::CellInfo::CellInfo()
 
 
 InsetMathGrid::RowInfo::RowInfo()
-	: lines_(0), skip_(0)
+	: lines_(0), skip_(0), allow_pagebreak_(true)
 {}
 
 
@@ -616,6 +616,8 @@ docstring InsetMathGrid::eolString(row_t
 
 	if (!rowinfo_[row].crskip_.zero())
 		eol += '[' + from_utf8(rowinfo_[row].crskip_.asLatexString()) + ']';
+	else if(!rowinfo_[row].allow_pagebreak_)
+		eol += '*';
 
 	// make sure an upcoming '[' does not break anything
 	if (row + 1 < nrows()) {
Index: src/mathed/InsetMathGrid.h
===================================================================
--- src/mathed/InsetMathGrid.h	(Revision 17470)
+++ src/mathed/InsetMathGrid.h	(Arbeitskopie)
@@ -62,6 +62,8 @@ public:
 		LyXLength crskip_;
 		/// extra distance between lines
 		int skip_;
+		/// Is a page break allowed after this row?
+		bool allow_pagebreak_;
 	};
 
 	// additional per-row information
Index: src/mathed/MathParser.C
===================================================================
--- src/mathed/MathParser.C	(Revision 17470)
+++ src/mathed/MathParser.C	(Arbeitskopie)
@@ -111,7 +111,7 @@ bool stared(docstring const & s)
  * environments like "equation" that have a fixed number of rows.
  */
 bool addRow(InsetMathGrid & grid, InsetMathGrid::row_type & cellrow,
-	    docstring const & vskip)
+	    docstring const & vskip, bool allow_pagebreak = true)
 {
 	++cellrow;
 	if (cellrow == grid.nrows()) {
@@ -128,11 +128,14 @@ bool addRow(InsetMathGrid & grid, InsetM
 			lyxerr << "ignoring extra row";
 			if (!vskip.empty())
 				lyxerr << " with extra space " << to_utf8(vskip);
+			if (!allow_pagebreak)
+				lyxerr << " with no page break allowed";
 			lyxerr << '.' << endl;
 			return false;
 		}
 	}
 	grid.vcrskip(LyXLength(to_utf8(vskip)), cellrow - 1);
+	grid.rowinfo(cellrow - 1).allow_pagebreak_ = allow_pagebreak;
 	return true;
 }
 
@@ -1013,7 +1016,13 @@ void Parser::parse1(InsetMathGrid & grid
 		else if (t.cs() == "\\") {
 			if (flags & FLAG_ALIGN)
 				return;
-			if (addRow(grid, cellrow, getArg('[', ']'))) {
+			bool added;
+			if (nextToken().asInput() == "*") {
+				getToken();
+				added = addRow(grid, cellrow, docstring(), false);
+			} else
+				added = addRow(grid, cellrow, getArg('[', ']'));
+			if (added) {
 				cellcol = 0;
 				if (grid.asHullInset())
 					grid.asHullInset()->numbered(