if no systray containment was found in config
immediately create the containment, so the
scripting shell can correctly find it
the javascript needs to be slighlty modified as:
var systray = panel.addWidget("org.kde.plasma.systemtray")
var id = systray.readConfig("SystrayContainmentId")
var systrayContainment = desktopById(id)
print(systrayContainment)
systrayContainment.currentConfigGroup = ["General"]
systrayContainment.writeConfig("extraItems","...
Marco Martin
Aleix Pol