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This GdkEventController is a helper object to handle pad events, it allows setting a mapping to action names, to be triggered in the given action group. In order to help on places where advanced mapping/configurability of pad features is not desirable, this controller also allows passing a NULL pad device, meaning it will listen on all pads, and/or passing -1 on mode/index, so an action applies to all modes/features (eg. strips/rings).
