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Refactor and Modularize the Shutdown Helper
The code in xfce4-session that deals with logging out, suspending, shutting down etc. is a bit of a mess. It mixes code related to PolicyKit, ConsoleKit and sudo. We would like to clean this up in order to improve the code quality and error reporting. An idea would be to have a plugin interface for this and have plugins for PolicyKit, ConsoleKit and sudo that are processed after each other. We could consolidate the error messages and determine what to do way better than we do at the moment.