Prevent resize, but allow drag for specific events

Hi,

Our use case is that an appointment is fixed in time, but we can change the resource. So I’d like to be able to drag the event up/down between resources, but not left/right.

Right now I have this working by setting the invalid ranges to any date outside the start/end, but it still allows the event to be reduced in length by resizing.

Ideally it would be good to be able to cancel the drag/drop in onEventDragStart, rather than let the user drag the event and catch it on update.