Use XEP-0352: Client State Indication in QXmpp v0.9.4 or later

As soon as Kaidan gets minimized now it will send the inactive state to
the server that will filter unimportant messages upon this. Most of the
filtered messages will be sent from the server when Kaidan gets active
again.

src/ClientWorker.cpp

@@ -71,6 +71,11 @@ ClientWorker::ClientWorker(Caches *caches, Kaidan *kaidan, bool enableLogging, Q
 	client->versionManager().setClientName(APPLICATION_DISPLAY_NAME);
 	client->versionManager().setClientVersion(VERSION_STRING);
 	client->versionManager().setClientOs(QSysInfo::prettyProductName());
+
+#if QXMPP_VERSION >= 0x000904
+	// Client State Indication
+	connect(app, &QGuiApplication::applicationStateChanged, this, &ClientWorker::setCsiState);
+#endif
 }
 
 ClientWorker::~ClientWorker()
@@ -159,3 +164,13 @@ QString ClientWorker::generateRandomString(unsigned int length) const
 	}
 	return randomString;
 }
+
+#if QXMPP_VERSION >= 0x000904 // after QXmpp v0.9.4
+void ClientWorker::setCsiState(Qt::ApplicationState state)
+{
+	if (state == Qt::ApplicationActive)
+		client->setActive(true);
+	else
+		client->setActive(false);
+}
+#endif

src/ClientWorker.h

@@ -174,6 +174,13 @@ private slots:
 	 */
 	void onConnectionError(QXmppClient::Error error);
 
+#if QXMPP_VERSION >= 0x000904 // after QXmpp v0.9.4
+	/**
+	 * Uses the QGuiApplication state to reduce network traffic when window is minimized
+	 */
+	void setCsiState(Qt::ApplicationState state);
+#endif
+
 private:
 	/**
 	 * Generates a random alphanumeric string