Drag and drop positioning of new menu item

Made some progress on this in branch 3526919-drag-and-drop ... ran into trouble when calculating a weight for a new item between two existing items with weights having "no room in between".

How do I set a weight between weights -48 and -47?

@jdewit since you have been very active in this modules issue queue perhaps you would like to review this?

Automatically closed - issue fixed for 2 weeks with no activity.