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steps to reproduce: create an class, let it implement Interface1. the ide offers a hint to implement it's methods. then add an abstract methods -> need to make the class abstract as well. then decide to implement Interface2 -> ERROR no hints offered. a workaround is to: remove the abstract keywork and comment out the abstract method. I think the ide should not take the abstractness of the class into account when suggesting hints. (or at least the "Implement methods" hint)
Sorry, but I do not think we can call this a defect - it is currently as designed.