Thanks for sharing. So there is no option to change the Win key in Blender4, to use (for example) AltGr (right Alt) instead?

What happens if you remove the gaps between windows? Just guessing, but maybe the bug simply takes the gap width and uses it for the inner padding? I don’t use gaps at all and I’ve never experienced this issue. (Docs: https://i3wm.org/docs/userguide.html#gaps)

parcellite is a lightweight clipboard manager, I use it in i3. It has some useful features and supports basic key bindings. A more advanced one is xfce4-clipman (works standalone without Xfce, uses Gtk).