Minimap cell dragging is broken

[oluckyman]

Describe the bug

When I drag cell in minimap, the cell ends up in the end of the notebook instead of the dropped location. Also three is no visual feedback during the dragging.

To Reproduce Steps to reproduce the behavior:

1. Go to whatever notebook (e.g. https://observablehq.com/@observablehq/minimap)
2. Open minimap
3. Try to drag & drop a cell
4. See how it moves to the end of the notebook.

Expected behavior Cell moves between cells where it was dropped and there is visual feedback so I can see where it will be before I drop it.

Screenshots

https://user-images.githubusercontent.com/642673/213514373-736301f2-706e-40ac-b7f0-0d87ea7e3487.mov

Desktop (please complete the following information):

• OS: macOS
• Browser chrome (sidekick, arc), safari

[tophtucker]

😯 I can reproduce. Looking into it!

[tophtucker]

@oluckyman This should be fixed now (thanks entirely to @libbey-observable who beat me to it 😅) — let us know if you see it again.