In a scenario when an event is dragged and is not saved due to an error while updating, or in case saving is prevented, next time when the user tries to drag the same event, the event hint will be misplaced.
The second time the same event is being dragged its hint is rendered in a wrong place. In case the same event is dragged multiple times, the hint is getting more and more away from the original position.
The event hint should always be rendered starting from the event's position.