Selection monitor based on focus, not on mouse

[sarmong]

This is in regards to this comment.

I use tiling wm and focus is not always where the mouse is

[phuhl]

Hi, I think that would be difficult to implement, as it probably depends on the wm on how this would work. If you do find a general solution (i.e., a solution that works with all WMs), I am open to a PR

[sarmong]

I just found this , seems like a solution, but haven't tested yet.

For bspwm it is super easy - bspc query -T -m focused --names

I'll try to make a PR later, but I have no knowledge of haskell, so that will be a challenge