Fix checks based on window.ActiveXObject in IE > 10

Conflicts:
	CHANGELOG

CHANGELOG

@@ -4,6 +4,7 @@ CHANGELOG Roundcube Webmail
 - Fix bug where some valid text in a message was handled as uuencoded attachment
 - Fix wrong icon for download button in classic skin
 - Fix bug where sent message was saved in Sent folder even if disabled by user (#1490208)
+- Fix checks based on window.ActiveXObject in IE > 10
 
 RELEASE 1.0.4
 -------------

program/js/app.js

@@ -7680,7 +7680,7 @@ function rcube_webmail()
     if (plugin && plugin.enabledPlugin)
         return 1;
 
-    if (window.ActiveXObject) {
+    if ('ActiveXObject' in window) {
       try {
         if (axObj = new ActiveXObject("AcroPDF.PDF"))
           return 1;
@@ -7713,7 +7713,7 @@ function rcube_webmail()
     if (plugin && plugin.enabledPlugin)
         return 1;
 
-    if (window.ActiveXObject) {
+    if ('ActiveXObject' in window) {
       try {
         if (axObj = new ActiveXObject("ShockwaveFlash.ShockwaveFlash"))
           return 1;

program/js/common.js

@@ -93,7 +93,7 @@ function roundcube_browser()
   this.xmlhttp_test = function()
   {
     var activeX_test = new Function("try{var o=new ActiveXObject('Microsoft.XMLHTTP');return true;}catch(err){return false;}");
-    this.xmlhttp = (window.XMLHttpRequest || (window.ActiveXObject && activeX_test()));
+    this.xmlhttp = window.XMLHttpRequest || (('ActiveXObject' in window) && activeX_test());
     return this.xmlhttp;
   };