From 1e999e389ed3c5e61ad404c8379ac87b56b5ae30 Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Tue, 14 Jun 2016 15:32:53 -0400
Subject: [PATCH] Don't have preprocessors make a preview if there already is
 one.  Resolves issue #1445.

---
 unpacked/extensions/asciimath2jax.js | 4 +++-
 unpacked/extensions/jsMath2jax.js    | 5 ++++-
 unpacked/extensions/mml2jax.js       | 6 ++++--
 unpacked/extensions/tex2jax.js       | 4 +++-
 4 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/unpacked/extensions/asciimath2jax.js b/unpacked/extensions/asciimath2jax.js
index f6fae5206..2ca0ffbcc 100644
--- a/unpacked/extensions/asciimath2jax.js
+++ b/unpacked/extensions/asciimath2jax.js
@@ -207,11 +207,13 @@ MathJax.Extension.asciimath2jax = {
   },
   
   createPreview: function (mode,asciimath) {
+    var previewClass = MathJax.Hub.config.preRemoveClass;
     var preview = this.config.preview;
     if (preview === "none") return;
+    if ((this.search.close.previousSibling||{}).className === previewClass) return;
     if (preview === "AsciiMath") {preview = [this.filterPreview(asciimath)]}
     if (preview) {
-      preview = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);
+      preview = MathJax.HTML.Element("span",{className:previewClass},preview);
       this.insertNode(preview);
     }
   },
diff --git a/unpacked/extensions/jsMath2jax.js b/unpacked/extensions/jsMath2jax.js
index 03b8ff3ee..188119711 100644
--- a/unpacked/extensions/jsMath2jax.js
+++ b/unpacked/extensions/jsMath2jax.js
@@ -73,10 +73,13 @@ MathJax.Extension.jsMath2jax = {
   },
   
   createPreview: function (node) {
+    var previewClass = MathJax.Hub.config.preRemoveClass;
     var preview = this.config.preview;
+    if (preview === "none") return;
+    if ((node.previousSibling||{}).className === previewClass) return;
     if (preview === "TeX") {preview = [this.filterPreview(node.innerHTML)]}
     if (preview) {
-      preview = MathJax.HTML.Element("span",{className: MathJax.Hub.config.preRemoveClass},preview);
+      preview = MathJax.HTML.Element("span",{className:previewClass},preview);
       node.parentNode.insertBefore(preview,node);
     }
   },
diff --git a/unpacked/extensions/mml2jax.js b/unpacked/extensions/mml2jax.js
index 6b3ce1531..995ba94c1 100644
--- a/unpacked/extensions/mml2jax.js
+++ b/unpacked/extensions/mml2jax.js
@@ -203,6 +203,8 @@ MathJax.Extension.mml2jax = {
     var preview = this.config.preview;
     if (preview === "none") return;
     var isNodePreview = false;
+    var previewClass = MathJax.Hub.config.preRemoveClass;
+    if ((script.previousSibling||{}).className === previewClass) return;
     if (preview === "mathml") {
       isNodePreview = true;
       // mathml preview does not work with IE < 9, so fallback to alttext.
@@ -225,10 +227,10 @@ MathJax.Extension.mml2jax = {
     if (preview) {
       var span;
       if (isNodePreview) {
-        span = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass});
+        span = MathJax.HTML.Element("span",{className:previewClass});
         span.appendChild(preview);
       } else {
-        span = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);
+        span = MathJax.HTML.Element("span",{className:previewClass},preview);
       }
       script.parentNode.insertBefore(span,script);
     }
diff --git a/unpacked/extensions/tex2jax.js b/unpacked/extensions/tex2jax.js
index 26238818b..393dd96ca 100644
--- a/unpacked/extensions/tex2jax.js
+++ b/unpacked/extensions/tex2jax.js
@@ -277,11 +277,13 @@ MathJax.Extension.tex2jax = {
   },
   
   createPreview: function (mode,tex) {
+    var previewClass = MathJax.Hub.config.preRemoveClass;
     var preview = this.config.preview;
     if (preview === "none") return;
+    if ((this.search.close.previousSibling||{}).className === previewClass) return;
     if (preview === "TeX") {preview = [this.filterPreview(tex)]}
     if (preview) {
-      preview = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);
+      preview = MathJax.HTML.Element("span",{className:previewClass},preview);
       this.insertNode(preview);
     }
   },