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I consider stopper is one think to organize time and people are watching on clock to check how many time amount they have.

Also adding stopper plasmoid to KDE is not far good, because always I need different amount of stoppers.

Creating one plasmoid with add stopper button is great idea, but I think including it into calendar shuffle are great.

Stoppers, which count to 0 should emit signal to notification system and destroy themselves.

Thanks.