App-specific notifications' behavior are now managed with KConfigXT. The default values are set in plasmanotifyrc shipped with the libnotificationmanager and can be override.
Immutability can be set at applicatioin level in plasmanotifyrc.
Reinitialize button reset all modifications not applied. Default button does not reset to default applications' behavior (same as before).
Require D27059 D27133 D27155