swirl | Use Tornado 's asynchronous features without using callbacks | Web Framework library

I have a relatively simple web app that I'm creating as a bookshelf and I want the user to be able to drag and drop books between the bookshelves. It works exactly as I want when I drop a book to the "right" side of the existing books in one of the bookshelves. The book that has been dragged and dropped is added to the shelf.

Where it isn't working is when I drop a book on top of an existing book. When I do that, the book is removed from the existing shelf -- but it disappears totally instead of being added to the targeted bookshelf as I desire. Its unclear to me why this is.

See here: https://mainstringargs.github.io/bookshelf-data/test.html

(I'm using Firefox, if that is relevant)

Relevant source code is here (raw html): https://github.com/mainstringargs/bookshelf-data/blob/master/test.html

Note: This was originally generated via jekyll in github, but since this problem is not jekyll centric, I'm not including that source code detail.

I largely followed this guide for how to implement drag and drop:

https://www.w3schools.com/html/html5_draganddrop.asp

The relevant javascript code is below. The 'drop' function is intended to drop the relevant list item to the new list.

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Playground URL:URL

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