Linux: Add autostart delay to avoid tray issues #6518

It seems that sometimes the tray implementation isn't ready on system
startup. Retrying later seems to not help. Delaying the start of the
client is the workaround that people have reported as effective.

src/common/utility_unix.cpp

@@ -76,7 +76,8 @@ void setLaunchOnStartup_private(const QString &appName, const QString &guiName,
            << QLatin1String("Categories=") << QLatin1String("Network") << endl
            << QLatin1String("Type=") << QLatin1String("Application") << endl
            << QLatin1String("StartupNotify=") << "false" << endl
-           << QLatin1String("X-GNOME-Autostart-enabled=") << "true" << endl;
+           << QLatin1String("X-GNOME-Autostart-enabled=") << "true" << endl
+           << QLatin1String("X-GNOME-Autostart-Delay=10") << endl;
     } else {
         if (!QFile::remove(desktopFileLocation)) {
             qCWarning(lcUtility) << "Could not remove autostart desktop file";