As a user, I would like to add issues in an active sprint to an epic

COS:

• Allow dragging of the story but make sure that the droppable area in the backlog does not indicate anything that might make the user think they were dropping the story from the sprint

Testing Notes

Q: Can you multi-select issues and drag them into an epic from the active sprint?
A: Yes

Q: What if you multi-select issues from both the active sprint and from the backlog and drag to an epic?
A: We can't do that, should we ?

Q: What if the epics panel is collapsed and you drag to it?
A: Works the same way it would if it was open

Q: What happens when you drag to the edges of the screen?
A: If there is non visible space it scrolls, nothing else

Q: What if the issues from the active sprint are already in another epic when you drag to a new one?
A: The issue is affected to the new epic

Q: What if a quick/instant filter is on while dragging?
A: Issues are filtered out and not selectable

Q: Any difference if the Epic is expanded or collapsed?
A: No