Drag and drop for lists and tables only works on indexes

[kkoreilly]

Describe the bug

This is especially bad given that we do not render the indexes by default now. We should somehow figure out how to support the user dragging the entire row as a cohesive drag-and-drop entity (this should be easier for lists, which just have one widget per row, whereas tables have several different discrete widgets).

How to reproduce

Go to the table page on the docs and observe that drag-and-drop does not work unless you right click, Toggle indexes, and then drag on the indices, not the rows.

Example code

Relevant output

Platform

macOS