backport live changes

www/common/common-util.js

@@ -122,5 +122,14 @@ define([], function () {
         xhr.send(null);
     };
 
+    Util.throttle = function (f, ms) {
+        var to;
+        var g = function () {
+            window.clearTimeout(to);
+            to = window.setTimeout(f, ms);
+        };
+        return g;
+    };
+
     return Util;
 });

www/common/cryptpad-common.js

@@ -71,6 +71,7 @@ define([
     common.bytesToMegabytes = Util.bytesToMegabytes;
     common.bytesToKilobytes = Util.bytesToKilobytes;
     common.fetch = Util.fetch;
+    common.throttle = Util.throttle;
 
     // import hash utilities for export
     var createRandomHash = common.createRandomHash = Hash.createRandomHash;