super key not working in Neovim on Linux

Question

I'm trying to create a shortcut, but I can't get vim to recognize my super key. I tried the following combinations:

lvim.keys.normal_mode["<A-h>"] = ":BufferLineCyclePrev<cr>"
lvim.keys.normal_mode["<A-l>"] = ":BufferLineCycleNext<cr>"

lvim.keys.normal_mode["<M-h>"] = ":BufferLineCyclePrev<cr>"
lvim.keys.normal_mode["<M-l>"] = ":BufferLineCycleNext<cr>"

lvim.keys.normal_mode["<D-h>"] = ":BufferLineCyclePrev<cr>"
lvim.keys.normal_mode["<D-l>"] = ":BufferLineCycleNext<cr>"

The above shortcuts work for Alt+h|l but not for Super+h|l.

I tried with running Neovim in the terminal (alacritty) and also with a graphical client (Neovide)... without luck.

I use arch linux + xorg.

I have no problems with the super key in other apps.

Does anyone have an idea what I can do about this?

Answer 1

@Martin Tournoij was right, alacritty could not recognize the super key.

I ended up using this hacky solution.

With these key bindings in alacritty.yaml:

key_bindings:

 - { key: H,         mods: Super,       chars: "\x1bh"                       }
 - { key: L,         mods: Super,       chars: "\x1bl"                       }
 

I could make the Super key act like the Alt key for h and l, allowing me to use: <A-h> <A-l> in nvim.

More info on this hack: https://github.com/alacritty/alacritty/issues/62#issuecomment-347552058