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Is this something that only neovim had? My suggestion plugins in nvim pop over just below the cursor.

Yes, it's only now a feature with Vim 8.2.

Edit: Or maybe only "officially" now with the new floating window API instead of having to roll your own code.

In any case I really appreciate what Neovim is doing to push Vim into adding features. I hope one day they converge into a single tool.

I don't know the details of 8.2, but floating windows have been possible since a long time (e.g. YouCompleteMe https://github.com/ycm-core/YouCompleteMe)

Completion popups were already available, but were specific to completion. They couldn't be used outside that context.

Popup menus have been a thing since long time ago. Nvim floating windows are true arbitrary windows (they are placed in floating layers over other windows and then composited within the grid; in more flexible UIs they can be handled independently); I assume vim 8.2 floating windows are more or less the same.

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