Fix HTML display of math matrices.

(cherry picked from commit 60ce2b7570)

src/mathed/InsetMathGrid.cpp

@@ -26,6 +26,7 @@
 #include "FuncStatus.h"
 #include "Cursor.h"
 #include "FuncRequest.h"
+#include "LaTeXFeatures.h"
 
 #include "frontends/Clipboard.h"
 #include "frontends/Painter.h"
@@ -1237,6 +1238,19 @@ void InsetMathGrid::htmlize(HtmlStream & os) const
 }
 
 
+void InsetMathGrid::validate(LaTeXFeatures & features) const
+{
+	if (features.runparams().math_flavor == OutputParams::MathAsHTML
+	    && (nrows() > 1 || ncols() > 1)) {
+		// CSS taken from InsetMathCases
+		features.addCSSSnippet(
+			"table.mathtable{display: inline-block; text-align: center; border: none;"
+			"border-left: thin solid black; vertical-align: middle; padding-left: 0.5ex;}\n"
+			"table.mathtable td {text-align: left; border: none;}");
+	}
+}
+
+
 void InsetMathGrid::write(WriteStream & os) const
 {
 	write(os, 0, 0, nrows(), ncols());

src/mathed/InsetMathGrid.h

@@ -239,6 +239,8 @@ public:
 	///
 	void htmlize(HtmlStream &, std::string attrib) const;
 	///
+	void validate(LaTeXFeatures & features) const;
+	///
 	//void octave(OctaveStream &) const;
 
 protected:

status.22x

@@ -100,6 +100,8 @@ What's new
 - Add "dir='auto'" to body tag, which should help a lot with export of
   RTL languages (bug 8279, partly).
 
+- Fix display of cases and matrices (bugs 8753, 8755).
+
 
 * TEX2LYX