From 9178a9af0eb739809dedb13cf0a7d81075f9a71d Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Fri, 26 Apr 2013 13:29:35 -0400
Subject: [PATCH] Properly handle preview of 'none' in all preprocessors, and
 preview of 'alttext' in mml2jax.  See note on commit d2bbe75.

---
 unpacked/extensions/asciimath2jax.js | 1 +
 unpacked/extensions/mml2jax.js       | 5 +++--
 unpacked/extensions/tex2jax.js       | 1 +
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/unpacked/extensions/asciimath2jax.js b/unpacked/extensions/asciimath2jax.js
index 03c701a1b..a53f37eec 100644
--- a/unpacked/extensions/asciimath2jax.js
+++ b/unpacked/extensions/asciimath2jax.js
@@ -204,6 +204,7 @@ MathJax.Extension.asciimath2jax = {
   
   createPreview: function (mode,asciimath) {
     var preview = this.config.preview;
+    if (preview === "none") return;
     if (preview === "AsciiMath") {preview = [this.filterPreview(asciimath)]}
     if (preview) {
       preview = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);
diff --git a/unpacked/extensions/mml2jax.js b/unpacked/extensions/mml2jax.js
index b75ee632e..27197e78a 100644
--- a/unpacked/extensions/mml2jax.js
+++ b/unpacked/extensions/mml2jax.js
@@ -177,10 +177,11 @@ MathJax.Extension.mml2jax = {
   
   createPreview: function (math,script) {
     var preview = this.config.preview;
+    if (preview === "none") return;
     if (preview === "alttext") {
       var text = math.getAttribute("alttext");
-      if (text != null) {preview = [this.filterPreview(text)]}
-    }
+      if (text != null) {preview = [this.filterPreview(text)]} else {preview = null}
+    } 
     if (preview) {
       preview = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);
       script.parentNode.insertBefore(preview,script);
diff --git a/unpacked/extensions/tex2jax.js b/unpacked/extensions/tex2jax.js
index f6b7b4111..529104bce 100644
--- a/unpacked/extensions/tex2jax.js
+++ b/unpacked/extensions/tex2jax.js
@@ -274,6 +274,7 @@ MathJax.Extension.tex2jax = {
   
   createPreview: function (mode,tex) {
     var preview = this.config.preview;
+    if (preview === "none") return;
     if (preview === "TeX") {preview = [this.filterPreview(tex)]}
     if (preview) {
       preview = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);