Convert a 24h event into a day event not possible

[ZeHiro]

Go to the weekly view
Create an event from day d "00:00" to day d+1 "00:00", basically a full day event.
Try to drag and drop the event in the upper part of the weekly view (where the 'one day events' are displayed).
I expect the event to be turned into a 'one day event', but the event is not updated.
The same occurs with a 2hours event.