Do not copy languageMain and languageRoot

[fritzmg]

When you copy an event for instance, the languageMain value should not be copied, since it might end up being copied to the main calendar and then you end up with a main event that still has a languageMain reference to another main event.

[aschempp]

hmm, thats kinda true. However, if my main language is en and I copy something from fr to de, I want to keep the main language set, otherwise I would need to re-assign all over again. Maybe we need to have an oncopy_callback that prevents such wrong data?

[fritzmg]

hmm, thats kinda true. However, if my main language is en and I copy something from fr to de, I want to keep the main language set, otherwise I would need to re-assign all over again.

If you copy your main language, it won't automatically have references to itself, will it? Ah, I misread that. Yes, I suppose that use case should be supported 👍