Setting _NET_ACTIVE_WINDOW to emacs when non-EXWM buffer in focus

[ErikPrantare]

I use a program (talon voice) that gets information about the currently active window by reading its title. It gets the active window through reading _NET_ACTIVE_WINDOW. In EXWM, this is only set when focusing X windows. Is it possible to have it be set to the emacs window whenever a regular buffer is in focus?

[Stebalien]

Makes sense. We'd have to set it to the workspace frame instead of xcb:Window:None here:

exwm/exwm-input.el

Line 395 in f453664

:data (or id xcb:Window:None))))

We'd also need to make sure to update it when switching workspaces.