RFC: [kwinrules] Update from window menu when the KCM is already open
By connecting to ConfigModule::updateArguments() signal,
the window UUID passed by Edit .. specific properties menu
can be processed when the KCM is already open.
This allows for subsequent calls from different windows into the same KCM instance. If the same window is called twice, the corresponding rule will be detected by the matching mechanism.
Follow-up of !134 (merged). Requires frameworks/kconfigwidgets!26 (closed), frameworks/kcmutils!27 (closed) and frameworks/kdeclarative!28 (closed) to implement the dBus method and pass the signal around. Mechanism explained in frameworks/kcmutils#1 (closed)