Thanks for your MR, that looks good to me!

The pipeline fails, because you also need to update the call to tsm_screen_draw() in src/gtktsm/gtktsm-terminal.c

../src/gtktsm/gtktsm-terminal.c:1055:21: error: too few arguments to function ‘tsm_screen_draw’
1055 | rend->age = tsm_screen_draw(ctx->screen,

Also This breaks backward compatibility (an old version of kmscon won't work with a new version of libtsm).
Let me some time to think if we can find a way to not break the API.

The pipeline fails, because you also need to update the call to tsm_screen_draw() in src/gtktsm/gtktsm-terminal.c

../src/gtktsm/gtktsm-terminal.c:1055:21: error: too few arguments to function ‘tsm_screen_draw’ 1055 | rend->age = tsm_screen_draw(ctx->screen,

I added double width support to Gtktsm, so this should be fixed now.

@kdj0c @michael-oberpriller There is no need to break the ABI IMHO. I've figured out a way to emulate what most major terminals do (as shown in Aetf/kmscon#18). In fact, no changes are needed for libtsm. I will submit a PR shortly.

@michael-oberpriller @kdj0c please see Aetf/kmscon#136. Hopefully one of you can find it useful to do proper implementation.

These changes have been implemented in Aetf/kmscon#135.