Fixed excessive polling behavior

diff --git a/wcfsetup/install/files/js/WoltLabSuite/Core/Notification/Handler.js b/wcfsetup/install/files/js/WoltLabSuite/Core/Notification/Handler.js
index b600007dc33432f1d7ad28011735d8760d32d976..46b33b4599937157ed7acfa86aa9e6bed4be7ebf 100644 (file)
--- a/wcfsetup/install/files/js/WoltLabSuite/Core/Notification/Handler.js
+++ b/wcfsetup/install/files/js/WoltLabSuite/Core/Notification/Handler.js
@@ -49,7 +49,7 @@ define(['Ajax', 'Core', 'EventHandler'], function(Ajax, Core, EventHandler) {
                        document.addEventListener('visibilitychange', this._onVisibilityChange.bind(this));
                        window.addEventListener('storage', this._onStorage.bind(this));
                        
-                       this._onVisibilityChange();
+                       this._onVisibilityChange(null);
                        
                        if (options.enableNotifications) {
                                switch (window.Notification.permission) {
@@ -70,19 +70,20 @@ define(['Ajax', 'Core', 'EventHandler'], function(Ajax, Core, EventHandler) {
                /**
                 * Detects when this window is hidden or restored.
                 * 
+                * @param       {Event}         event
                 * @protected
                 */
-               _onVisibilityChange: function() {
-                       _inactiveSince = (document.hidden) ? Date.now() : 0;
-                       
+               _onVisibilityChange: function(event) {
                        // document was hidden before
-                       if (!document.hidden) {
+                       if (event !== null && !document.hidden) {
                                var difference = (Date.now() - _inactiveSince) / 60000;
                                if (difference > 4) {
                                        this._resetTimer();
                                        this._dispatchRequest();
                                }
                        }
+                       
+                       _inactiveSince = (document.hidden) ? Date.now() : 0;
                },
                
                /**