2.0.0-rc issue with drag&drop and helper functions (to copy)

[adumesny]

Subject of the issue

when you drag from outside and use the helper function to clone the original item, you find the item disappearing from the list (say toolbar of items to insert).

Your environment

• 2.0.0-rc

Expected behaviour

convert the helper copy into real widget and leave original dragged item intact.

[adumesny]

fix in upcoming 2.0.0-rc2