When I am running Chromium in EXWM I can fullscreen YouTube across two monitors using YouTube's fullscreen button or F, and I can fullscreen Chromium itself across two monitors with Emacs's C-c C-f which runs exwm-layout-set-fullscreen.
Naturally there isn't much point in watching a YouTube video on one half each of two monitors. How can I tell EXWM to fullscreen something across one monitor only?
Note that the problem exists in tiling mode as well as floating mode.
