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The main purpose of activities is organize work based on projects separation. Plasma supports stopping and resuming activities. In my opinion, next step should be saving activity to selected file or directory, but it should be only available if each process working on activity could be stopped/saved. Main purpose of this change is saving activity into project directory and integrate restoring an activity with programs, like KDevelop, Dolphin, etc.

Maybe in future allows to stop/resume single window, so I open image in KDevelop and stop Gwenview window, but that's needs brainstorm.