Validating UPROPERTY change

[anonymous_user_e1690214]

I have a TSubclassOf<> property which shouldn’t be allowed to be None; if the user ever tries to set it to None in the editor, I’d like it to reject the change.

Is there a way to do this without creating a custom property editor? (I’d consider that approach, except that Slate is currently entirely undocumented.) PreEditChange/PostEditChangeProperty doesn’t seem to have any way to reject the change, or to recover the old value.

[anonymous_user_e1690214]

Adding NoClear to the property definition stopped None from showing up. (Should that be documented? I had to paw through source code to figure out that it would do that.) Still, it would be good to know how to validate properties in general.