Fix problem with MathEvents where pinch gestures were not being registered if both fingers were in typeset equations. (This may still need more, but it is an improvement for now). Resolves issue #200.

unpacked/extensions/MathEvents.js

@@ -23,7 +23,7 @@
  */
 
 (function (HUB,HTML,AJAX,CALLBACK,OUTPUT,INPUT) {
-  var VERSION = "2.0";
+  var VERSION = "2.0.1";
   
   var EXTENSION = MathJax.Extension;
   var ME = EXTENSION.MathEvents = {version: VERSION};
@@ -428,8 +428,8 @@
     //
     start: function (event) {
       var now = new Date().getTime();
-      var dblTap = (now - TOUCH.last < TOUCH.delay);
-      TOUCH.last = now;
+      var dblTap = (now - TOUCH.last < TOUCH.delay && TOUCH.up);
+      TOUCH.last = now; TOUCH.up = false;
       if (dblTap) {
         TOUCH.timeout = setTimeout(TOUCH.menu,TOUCH.delay,event,this);
         event.preventDefault();
@@ -444,9 +444,11 @@
     //  Prevent the default action and issue a double click.
     //
     end: function (event) {
+      var now = new Date().getTime();
+      TOUCH.up = (now - TOUCH.last < TOUCH.delay);
       if (TOUCH.timeout) {
         clearTimeout(TOUCH.timeout);
-        delete TOUCH.timeout; TOUCH.last = 0;
+        delete TOUCH.timeout; TOUCH.last = 0; TOUCH.up = false;
         event.preventDefault();
         return EVENT.Handler((event.touches[0]||event.touch),"DblClick",this);
       }
@@ -457,7 +459,7 @@
     //  the contextual menu event.
     //
     menu: function (event,math) {
-      delete TOUCH.timeout; TOUCH.last = 0;
+      delete TOUCH.timeout; TOUCH.last = 0; TOUCH.up = false;
       return EVENT.Handler((event.touches[0]||event.touch),"ContextMenu",math);
     }