Cannot make a unique edit of a reoccurring event

[PeregrineLinux]

In other calendar programs, it is possible to edit a single instance of a reoccurring event without that edit then appearing in all instances of that event. To give a frivolous example, given a reoccurring event of a meeting every Monday morning, it would be nice to specify who is responsible to bring the doughnuts on a particular Monday.

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