I would like to nest two Cage instances in Weston. Does Cage allow app_id/app-id overriding?

[abotelho-cbn]

Weston requires Wayland clients to set app_id in order to position windows on specific displays.

Is there a way to override the app_id property at launch with Cage? This would allow launching one Cage instance on a primary display, and a second Cage instance on a secondary display.

Cheers

[joggee-fr]

Hi @abotelho-cbn,
I am not aware of such a feature for Cage.

However, I can see the main application title i.e. the one which gets the focus is "transferred" to the Wayland output when Cage is nested in an other Wayland compositor (wlr_wl_output_set_title()).
@emersion, do you think the app_id should also be transfered in this case?

[abotelho-cbn]

I'm not much of a C programmer, but that was my impression as well. I couldn't get a patched version of Debian 12's Cage to compile with changes though; I don't understand enough about what I'm reading to be able to figure it out.

How difficult would you expect adding flag or environment variable to override this would be?