Feature Request: Keybinding Chords

[zamlz]

Hello, thank you very much for making niri. I haven't found a window I have liked this much since I started using herbstluftwm a long time ago. niri just makes things so simple and intuitive while giving you so much control.

A large part of my workflow relies on sxhkd. This tool pretty much only works in X11 though. A key feature of this tool is that you can define keybindings as key chords. I could define a keybinding like,

super + x, f
    command

super + x, d
    command

You can basically press super + x first, and in a short amount of time if you just press f, it would run another command.

This allowed me to create "contextual menus" through keybindings. I think this is super powerful really helps to organize keybindings! It would awesome if niri could support such a feature. I understand that this might require a lot of design as well. I would like to see if others feel this would a useful feature to add.