React on changes of the order of subtasks possible?

Hey there!

asking for a colleague of mine:

Is there an event for changing the order of subtasks on the issue detail view that I could listen to in order to create an action based on that change? 
I can't find a matching event and also the order change does not occur in  the issue history.
thanks in advance

Does anyone have any idea on that? Does such an event exist or is it impossible because the change of the order is just a visual thing? Or is it similar to the rank of a scrum backlog e.g.? Any help appreciated on that.