Set degraded mode limit in AppConfig

www/common/application_config_internal.js

@@ -179,5 +179,16 @@ define(function() {
     // You can change the value here.
     // config.maxOwnedTeams = 5;
 
+    // The userlist displayed in collaborative documents is stored alongside the document data.
+    // Everytime someone with edit rights joins a document or modify their user data (display
+    // name, avatar, color, etc.), they update the "userlist" part of the document. When too many
+    // editors are in the same document, all these changes increase the risks of conflicts which
+    // require CPU time to solve. A "degraded" mode can now be set when a certain number of editors
+    // are in a document at the same time. This mode disables the userlist, the chat and the
+    // position of other users' cursor. You can configure the number of user from which the session
+    // will enter into degraded mode. A big number may result in collaborative edition being broken,
+    // but this number depends on the network and CPU performances of each user's device.
+    config.degradedLimit = 8;
+
     return config;
 });

www/common/outer/cursor.js

@@ -2,11 +2,13 @@ define([
     '/common/common-util.js',
     '/common/common-constants.js',
     '/customize/messages.js',
+    '/customize/application_config.js',
     '/bower_components/chainpad-crypto/crypto.js',
-], function (Util, Constants, Messages, Crypto) {
+], function (Util, Constants, Messages, AppConfig, Crypto) {
     var Cursor = {};
 
-    var DEGRADED = 3; // XXX Number of users before switching to degraded mode
+    var DEGRADED = AppConfig.degradedLimit || 8;
+console.log(DEGRADED);
 
     var convertToUint8 = function (obj) {
         var l = Object.keys(obj).length;