only allow a limited number of notifications to be active at a time and queue the rest.

More than 100 outstatnding notifications crashed the windows backend,
this shouldn't happen to often but a crash isn't wat we ant too.

src/libsnore/snore.cpp

@@ -109,6 +109,12 @@ void SnoreCore::loadPlugins(SnorePlugin::PluginTypes types)
 void SnoreCore::broadcastNotification(Notification notification)
 {
     Q_D(SnoreCore);
+    if(d->m_activeNotifications.size() > d->maxNumberOfActiveNotifications())
+    {
+        snoreDebug(SNORE_DEBUG) << "queue size:" << d->m_notificationQue.size() << "active size:" << d->m_activeNotifications.size();
+        d->m_notificationQue.append(notification);
+        return;
+    }
     Q_ASSERT_X(!notification.data()->isBroadcasted(), Q_FUNC_INFO, "Notification was already broadcasted.");
     snoreDebug(SNORE_DEBUG) << "Broadcasting" << notification << "timeout:" << notification.timeout();
     if (d->m_notificationBackend != nullptr) {
@@ -117,7 +123,11 @@ void SnoreCore::broadcastNotification(Notification notification)
         }
     }
     notification.data()->setBroadcasted();
+    notification.addActiveIn(this);
+    if(!d->m_notificationBackend)
+    {
         d->startNotificationTimeoutTimer(notification);
+    }
     emit d->notify(notification);
 }
 

src/libsnore/snore_p.cpp

@@ -75,6 +75,7 @@ void SnoreCorePrivate::slotNotificationActionInvoked(Notification notification)
 void SnoreCorePrivate::slotNotificationDisplayed(Notification notification)
 {
     emit notificationDisplayed(notification);
+    startNotificationTimeoutTimer(notification);
 }
 
 bool SnoreCorePrivate::setBackendIfAvailible(const QString &backend)
@@ -225,6 +226,15 @@ void SnoreCorePrivate::slotNotificationClosed(Notification n)
 {
     Q_Q(SnoreCore);
     emit q->notificationClosed(n);
+    if(!n.removeActiveIn(q))
+    {
+        snoreDebug(SNORE_WARNING) << n << "was already closed";
+    }
+    if(!m_notificationQue.isEmpty() && m_activeNotifications.size() < maxNumberOfActiveNotifications())
+    {
+        snoreDebug(SNORE_DEBUG) << "Broadcast from queue" << m_notificationQue.size();
+        q->broadcastNotification(m_notificationQue.takeFirst());
+    }
 }
 
 void SnoreCorePrivate::slotAboutToQuit()

src/libsnore/snore_p.h

@@ -42,6 +42,11 @@ public:
      */
     static QString tempPath();
 
+    static constexpr int maxNumberOfActiveNotifications()
+    {
+        return 3;
+    }
+
 public:
     static SnoreCorePrivate *instance();
     ~SnoreCorePrivate();
@@ -108,6 +113,7 @@ private:
 
     QSettings *m_settings;
 
+    QList<Notification> m_notificationQue;
     QHash<uint, Snore::Notification> m_activeNotifications;
     friend class Snore::Notification;