Korganizer should hide duplicates from multiple calendars

Binary package hint: korganizer

I have two calendars: exchange, at work, and gcal. Via Korganizer's exchange plugin, I've synced exchange -> gcal, so that if I'm on the road I still have an up to date calendar that can send me SMS notifications, etc. Most of the time I will add new appointments via gcal, and then (if business related) sync then manually to exchange so that people in the office can see them. This leads to the same appointments frequently being in both calendars. In this situation, Korganizer should detect the duplication, and only show me one of them.

I'd say the duplication detection algorithm could work as follows:
* Time is exactly the same
* The subjects are exactly the same, and/or the levenstein distance is minor
* Appointment shows up in Korganizer with a "x2" icon next to it; if you click on the x2, it shows both.