Yeah also found this a bit weird. Fyi we do not prevent splitting of editors in the grid widget and have not heard complaints so far. So I am not sure why we need it here (cc @Tyriar).

We had one complaint about infinite splitting which is why I added this. I agree that behavior should generally be consistent between editor and terminal for splitting but at the same time allowing the user to put their terminal into a broken state isn't great either.

I was concerned that simply disabling the split operation wouldn't make why it's disabled clear, but it is more intrusive than just disabling it!

This issue has already gotten more thumbs ups than the original (#45678), so clearly something needs to be done 😄 @Tyriar, let me know what you think!

I think disabling the split action when we think it should be prevented is the best solution.

@alexr00 I guess we could watch for when the panel resizes and disable/enable if there's room.

I've created PR for changing the warn to info. The disable/enable for split is more complicated so it would be better to do during the next milestone. Issue #59414 tracks that!