Floating windows can be made resizable (and have borders and whatnot) in the GUI already, according to neovim devs. I remember neovim-gtk shows some popups different than others, but currently I only get these popups.
Floats should generally not cover the entire window.
https://files.gitter.im/neovim/neovim/8rAI/Screenshot_2020-01-25_17-21-10.png
Floating windows can be made resizable (and have borders and whatnot) in the GUI already, according to neovim devs. I remember neovim-gtk shows some popups different than others, but currently I only get these popups.
Floats should generally not cover the entire window.