[IMP] web: add a fix on underscore to support cancellableThrottle

addons/web/static/src/js/libs/underscore.js

@@ -0,0 +1,52 @@
+/**
+ * The _throttle in underscore has the feature to cancel the throttled function
+ * only starting version 1.9.0
+ * @todo remove this in master and update underscorejs to 1.9.1
+ */
+
+// Returns a function, that, when invoked, will only be triggered at most once
+// during a given window of time. Normally, the throttled function will run
+// as much as it can, without ever going more than once per `wait` duration;
+// but if you'd like to disable the execution on the leading edge, pass
+// `{leading: false}`. To disable execution on the trailing edge, ditto.
+
+_.cancellableThrottleRemoveMeSoon = function (func, wait, options) {
+    var timeout, context, args, result;
+    var previous = 0;
+    if (!options) options = {};
+
+    var later = function () {
+        previous = options.leading === false ? 0 : _.now();
+        timeout = null;
+        result = func.apply(context, args);
+        if (!timeout) context = args = null;
+    };
+
+    var throttled = function () {
+        var now = _.now();
+        if (!previous && options.leading === false) previous = now;
+        var remaining = wait - (now - previous);
+        context = this;
+        args = arguments;
+        if (remaining <= 0 || remaining > wait) {
+            if (timeout) {
+                clearTimeout(timeout);
+                timeout = null;
+            }
+            previous = now;
+            result = func.apply(context, args);
+            if (!timeout) context = args = null;
+        } else if (!timeout && options.trailing !== false) {
+            timeout = setTimeout(later, remaining);
+        }
+        return result;
+    };
+
+    throttled.cancel = function () {
+        clearTimeout(timeout);
+        previous = 0;
+        timeout = context = args = null;
+    };
+
+    return throttled;
+};

addons/web/views/webclient_templates.xml

@@ -107,6 +107,7 @@
         <script type="text/javascript" src="/web/static/src/js/libs/jquery.js"></script>
         <script type="text/javascript" src="/web/static/src/js/libs/download.js"></script>
         <script type="text/javascript" src="/web/static/src/js/libs/content-disposition.js"></script>
+        <script type="text/javascript" src="/web/static/src/js/libs/underscore.js"></script>
         <script type="text/javascript" src="/web/static/src/js/services/config.js"></script>
         <script type="text/javascript" src="/web/static/src/js/core/abstract_service.js"></script>
         <script type="text/javascript" src="/web/static/src/js/core/abstract_storage_service.js"></script>