Move glib usage to glibmm

Telegram/SourceFiles/platform/linux/linux_notification_service_watcher.cpp

@@ -10,16 +10,39 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "core/application.h"
 #include "main/main_domain.h"
 #include "window/notifications_manager.h"
-#include "platform/linux/specific_linux.h"
+#include "base/platform/linux/base_linux_dbus_utilities.h"
 
 #include <QtDBus/QDBusConnection>
 
 namespace Platform {
 namespace internal {
+namespace {
+
+constexpr auto kNotificationService = "org.freedesktop.Notifications"_cs;
+
+bool IsNotificationServiceActivatable() {
+	static const auto Result = [] {
+		try {
+			const auto connection = Gio::DBus::Connection::get_sync(
+				Gio::DBus::BusType::BUS_TYPE_SESSION);
+
+			return ranges::contains(
+				base::Platform::DBus::ListActivatableNames(connection),
+				Glib::ustring(std::string(kNotificationService)));
+		} catch (...) {
+		}
+
+		return false;
+	}();
+
+	return Result;
+}
+
+} // namespace
 
 NotificationServiceWatcher::NotificationServiceWatcher()
 : _dbusWatcher(
-		qsl("org.freedesktop.Notifications"),
+		kNotificationService.utf16(),
 		QDBusConnection::sessionBus(),
 		QDBusServiceWatcher::WatchForOwnerChange) {
 	const auto signal = &QDBusServiceWatcher::serviceOwnerChanged;