Vlad: Unfortunately, I have bad news. We're screwed. I poked people to clarify the language that is used in many specs. Here's the summary: if a spec says that an event is sent after creating an object and nowhere it says that the event is optional, then the compositor _must_ send the event. xdg_output::description is an optional event because the spec mentions it. On the other hand, xdg_output::name is mandatory because the spec has no a single word about it being optional. Dave: Pragmatically we know what every toolkit does and it's fine in reality so no need to panic, but we should fix it. I'll add some overload in Display for kwin to request the version number or something.
Alternatively I can do if (name.isEmpty()) { name = "Screen " + i++; } Which is all Qt would be doing client side anyway.